Harley-Davidson Evo Was The Original Milwaukee 8

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Harley-Davidson Evolution engines had a 4 valve cylinder head long before the Milwaukee 8 engine was ever even thought of. Feuling actually designed and manufactured a bolt on set of 4 valve heads for the big twin Evo engine. These heads made incredible power on a stock engine, they were a direct bolt, you could even run dual carburetors. Now while these were reliable and made excellent power, they were expensive and not really cost effective to add to your engine build. Other aftermarket companies started to try and build their own 4 valve heads, but with changes made to the design and trying to build them cheaper led to predictable results. In the late 2000's it even looked promising we might of seen a 4 valve head for the Twin Cam engines!
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9 фев 2023

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Комментарии : 202

@GixxerFoo Год назад

Have you every owned or seen an Evo powered Harley-Davidson with the 4 valve head setup?

@stevecrawford7814 Год назад

Heard of them don’t recall ever seeing them on a bike.

@atomicwedgie8176 Год назад

Try getting parts if it leaves you on the side of the road... parts are rare as hens teeth. Not worth it in my opinion.

@johndsmith7785 Год назад

YES, I've held a set of 4 valve heads in my hands. My thoughts at the time they were probably worth more than my EVO WG. Beautiful machine work...

@GlideYNRG Год назад

Was two sets of Fuelling 4 valve head's for sale locally recently, one a complete going concern complete with exhaust system. The second needed reworking. Was damn tempted.

@alanireland5222 Месяц назад

Yes I have Feuling Four Valve heads on my Fatboy Evo. Two Del orto carbs

@fearsomename4517 Год назад

I ride a '99 Heritage Springer last year evolution motor it's bulletproof. She rides like a dream. I'm going to leave her stock for now. She's still fast enough for me.

@GixxerFoo Год назад

Those are some beautiful motorcycles, stone cold reliable with that motor too!

@tellytruth8554 Год назад

I have a 96 springer & love it. Stupidly sold my 02 springer years ago with a cam/gear drive on the 88. Sweet bike. Had to get another springer but wanted the evo. Springer's & evos all the way!!

@jerryspencer5453 Год назад

Love those Heritage Springers. Mine is a 1998. Black with red. Windshield bag and the round duffel bag on a quick release luggage rack. It's not perfect but still pretty sweet. Got the first place trophy at a Harley dealer bike night. I also ride a 1998 Ultra Classic Electra Glide. I'm not sure what I'd do if I could keep only one. Sorry, no 4 valve heads.

@fearsomename4517 Год назад

@@jerryspencer5453 Mine is original paint too. Mine is Diamond Ice (silver) with a black a ribbon lined in Laser Red. She's all stock.

@jerryspencer5453 Год назад

@@fearsomename4517 sounds like a sweetheart

@geraldscott4302 Год назад

Jim Feuling was an amazing engineer. He even designed a W triple version of the EVO. H-D first showed some interest in that, then kind of backed away from it. While I found it kind of cool in a way, it added more complexity, and I like simplicity. As for the 4 valve heads, I see no purpose for them. Yes, they may have improved performance, but the EVO Harley was not a performance motorcycle. It was all about looks, sound, and feel. It was a cruiser, and there was no reason for it to go fast. I've always considered Harleys to be more or less touring bikes, and I don't just mean the big baggers with fairings. The FXRs, Dynas, and Softails were the kind of bikes you could strap a bedroll to, and take off across the country, Then Came Bronson style. I always liked that customized Softail Standard on the TV series "Renegade" I could see myself riding that cross country with just the bare essentials strapped to it, Easy Rider style. Lots of power is not required for that kind of riding. It's all about kicking back and relaxing. I have put many happy miles on my 1989 FXRS Low Rider that way.

@pb68slab18 Год назад

S.T.D. was another company that had some interesting and high-quality heads back in the day too.

@PaulNovack-kj4yz Год назад

I know a guy that runs these heads. He has multiple sets and use to know Feuling. He swears by them. I've rode with him and his bikes are very fast. I heard there was a guy in Florida that was connected with Feuling and he bought the rights to the heads. You should do a video on clutches. Specifically Rivera Primo pro clutch. Now the same clutch is being made by the original designer through American Prime MFG. They are all in the same circles from the past. I found your channel a couple years ago and never miss a video. I love your no nonsense approach and you give some great advice. Keep it up!

@GixxerFoo Год назад

Thank you, I appreciate the support! That's awesome you know someone that runs those heads, they are pretty rare these days to find a set!

@d1mennis Год назад

You're exactly right! I remember them being a short lived flash in the pan upgrade. For the same amount of money you could have put in a big bore kit, a better cam and had the heads ported and polished to give you more horsepower!

@paulf9459 Год назад

I have an 80 cu inch EVO with Edelbrock Street Performer heads and Wisco 10 to 1 pistons, I'm running an Andrew EV27 cam which is mild, stock pipes with the partition removed. The bike dyno's out, without a dyno tune at 85.9 HP and 89 ft tq. I did the work myself in 2000 for the cost of $1,276.00 with James gaskets and that included the cylinder honing by my local Harley dealer.

@GixxerFoo Год назад

That's awesome! A lot of people forgot about when Edelbrock made some awesome Harley parts!

@seH2i Год назад

I saw a set of these heads with that carb setup - SOLD $2,000. I have a 1996 Dyna Low Rider Convertible all original & stock. Love the Dyna Love the Evo Thank you Gixx great stuff as always

@GixxerFoo Год назад

Very cool! That's impressive to have a bike that's all stock after all these years!

@wanderinggander9286 Год назад

I never knew these heads existed. Always good info in your videos! 👍

@GixxerFoo Год назад

It's shame they were so expensive and never really caught on!

@nigesbasementworkshop9541 20 дней назад

Hi from the U.K., I run these heads on my stock 89 Heritage Classic , it looks like the centre post has had to be altered to clear the rear exhaust as it comes out of the head straight back and not offset like a standard Harley engine. Looks great and so far no issues. I also have a built up 88” engine with these heads sitting on the bench that I’ve had for years, long before I bought the Heritage. The castings and engineering are superb.

@jimwortham8634 Год назад

Thanks for posting remember when Evo came out everyone said evolution was a solution

@GixxerFoo Год назад

It was great motor! It's too bad they didn't continue to build on that platform, the M8 is similar but there's a lot they could of done to increase reliability like the Evo!

@125saito Год назад

Really quite interesting GF. Thanks for the history lesson. I had never heard of these heads.

@GixxerFoo Год назад

Any time!

@rugershooter5268 Год назад

I like the idea of a "4 barrel" on my Harleys, a 6pack on 318 was an amazing increase in fun over 2barrel.....it sucked down gas too, that is if you couldn't keep you foot off the floorboard.

@BraveClam Год назад

Nice upload, only ever seen one on display - Always wanted to see one on a running bike

@neilo.hislop950 Год назад

I knew a guy who had the original pre production Feuling 4 valve heads sent to him from Jim Feuling for Evaluation. They are SWEET.

@GixxerFoo Год назад

That's fricking cool! That would be something to have and hang onto for sure!

@dutchyjhome Год назад

Now this was a very informative video about 4 valve heads probably barely anybody ever has heard about ! Thank you very much about this info !

@bradmilkowski8490 Год назад

Had no idea they made a 4 value head. Great info!

@Jonathan-L Год назад

Just when I thought Gixxerfoo had already covered every possible topic on H-D engines, he surprises us all with this! :)

@ericalger5003 Год назад

I remember seeing bikes with 4 valve Fueling heads at Daytona Bike Week in the 90s. They weren't real common but they weren't exactly super rare either. The problem with making 100 plus hp on a stock Evolution Harley engine is the engine cases themselves. They would crack. Usually the bikes with Fueling 4 valve heads had aftermarket cases, generally S&S and STD. They were also always on FXR's.

@GixxerFoo Год назад

Those stock cases were the crapper on the Evo, now if you got some S&S cases your world really opened to possibilities.

@Indobiker61 9 месяцев назад

Read my comments..i think its one of the bikes you saw...

@JcNinja-fg6pi Год назад

Thanks for the great content! I had no idea this stuff existed! Keep up the good work!!!

@GixxerFoo Год назад

Thank you! They were around a long time it's just they were so expensive they really never gained popularity!

@donwaltman4276 Год назад

Great video Gixx, I never heard of such a thing

@GixxerFoo Год назад

I sure wish the new M8's sounded as good as that Evo with a 4 valve head!

@donwaltman4276 Год назад

Yeah,,, all that time and money, R+D,, and the sound is nowhere near as good

@metalted6128 Год назад

Another great video!! Good information!! Thank you

@seH2i Год назад

I appreciate you Gixx. Stay healtby~

@GixxerFoo Год назад

Thank you! I appreciate your support!

@throwingsparks Год назад

I was an avid reader of Hot Bike magazine back in the day, I remember seeing advertisement for the Fueling/ Rivera 4 valve heads.

@tobpitbull 4 месяца назад

I have a 1990 fxrs with a delkron/s&s 88” that I completely went through and tried to fix the issues known to exist… had bee hive springs made, and used Porsche 911 swivel feet and it really runs. Extremely fast anywhere in the throttle. I posted several videos of going through the heads.

@mikaldene7146 Год назад

Now you have my attention...I see a new quest in the making...98 Evo FLSTC 4 valve heads? Yeah Bro...Mikey Likey

@GixxerFoo Год назад

They are really trick if you can find a set!

@kjetillien4677 Год назад

Thank you for sharing! Always interesting content. I have a 1998 evo with stock heads, but I have upgraded exhoust, intake and cam. Did not know that 4-valve heads was an option. My evo runs so well, I will not change anything. Replacing the lifters this winter as a precaution, thats all. Thank you again!

@fearsomename4517 Год назад

I you're replacing the lifters might as well put a new cam in it. I plan do do the same, after ten thousand miles. Mine has low miles, considering.

@GixxerFoo Год назад

The cost of those heads was always nuts, I would really argue and likely why other than cost they didn't sell really well was you could get a high dollar port job on the two valve heads and make just as much power.

@deepskywishingwell2602 4 дня назад

This was the first time I heard about this. Great video

@GixxerFoo 2 дня назад

Thank you! Every now and again you'll run across one of these kits for sale out there or even a bike with one on it.

@chuckkropkeiii5837 Год назад

I remember 20 years ago or more seeing a sportster at a dealer and it said hemi on either the side of the rocker box or head. That was the only time I seen something like that.

@GixxerFoo Год назад

That's very interesting, I've only known those heads to be produced for the big twin.

@chuckkropkeiii5837 Год назад

@GixxerFoo My buddy worked at a dealer it wasn't a harley dealer they worked on everything. If I had a day off because of it being slow at work I would go there and help him and see what they were working on. What they did was they would buy wrecked or stolen bikes from the insurance company and they would rebuild them and sell them. They did complete repairs also it was all brands. The sporty was in there showroom and I seen it I asked my buddy about the heads as we are big chrysler fans. He said that was custom hemi heads made for the harleys. I asked if it was fast he said he never rode it. Nobody really cared about it, they mostly dealt with sport bikes. There was always odd and cool stuff there. My buddy would sell chrome and polished packages for people who wanted more bling on there sport bike The harleys had there own chrome stuff you can buy from there catalog but if there was something they did offer in chrome you would see my buddy. I want to say he started the polished and or chrome frame stuff at least around here. Now nobody wants that they want to black it all out. Sorry for rambling its just a flood of memories.

@portercoogan4862 Год назад

I did not know this!I have not been disappointed with my EVO but good to know.

@GixxerFoo Год назад

Port the heads and they will do you justice, the 4 valve was a great idea but wide open was the main benefit.

@kenchan5624 Год назад

I had rebuilt a set 4 valve head A couple years ago it’s actually not that difficult the most difficult part is adjusting the valve clearance on top of rocket box also setting the duo Italian carburettors, I end up ditch duo carb when to single S&S super E that makes it running very well since then.

@OZARKSHDRIDERS Год назад

Another awesome video my Foo brother👊🏽😎

@GixxerFoo Год назад

Thank you! Hope you been getting some riding in!

@OZARKSHDRIDERS Год назад

@@GixxerFoo not a whole lot of riding yet brother... But it won't be much longer now... Just doing a few upgrades to my bike for right now.... Keep those video's coming brother👊🏽😎

@ChrisS-sw1ll Год назад

Hey what's going on ,friend? 😄 I like yr vids , so informative. You have the big sign up for Andrews cams . I know yr a Woods fan from previous cam videos you done, so is there any chance you can do a bit of a rundown on Andrews cams for twin cam? They are very common and I think a lot of us would be interested. Keep up the great work. Cheers

@GixxerFoo Год назад

Andrews makes some killer cams! They actually manufacture Wood cams built to Bob Wood's specs, Andrews makes some iconic cams and honestly I think a lot of other manufacturers based their designs off Andrews.

@markfeye7408 Год назад

I sell Harleys for a living and a guy traded in a 98 wide glide with one of these 4 valve heads. Bike preformed amazing, and I was really surprised.

@johnsb1550 Год назад

Have you or will you do a video on the HTCC heads from Harley. I have read mixed reviews on these. I have an 02 FXDWG with these heads (among other parts) and it scares the hell out of me. Plus you and I both know that the 02 twin cam A engine was the last of the best (actual) production engines. At least I think you may agree. Great info as always 👍

@GixxerFoo Год назад

Those are some pretty serious heads from what I recall, 2002 was for sure the last year of the solid and reliable Timken setup. Shame they got away from that in the name of cost savings and more production.

@crspcritter Год назад

Yup ; knew a guy that had em . Drag bike only . There is an interesting article from speedfreak: twin cam more efficient than m8 . The way the m8 brings in air on intake is poor to the two valves . Should been like the v rod : downdraft from top two each valve . Well ; 110 heads sound even better now . ✊🏻👍👌🙏

@GixxerFoo Год назад

Thanks for sharing! Interesting you mentioned that, Feuling has 3 valve head for the M8. Curiously the Indian Thunderstroke runs a 3 valve head as well. That's something to thing about!

@stephendrake8145 Год назад

Yup, I remember the Fueling 4 valve heads for the Evo, always wanted them to make them for the Twin Cam, oh well...

@pb68slab18 Год назад

Didn't Fueling produce a 3 cylinder 'Harley' motor for a short while?

@GixxerFoo Год назад

They did, Feuling built one!

@GixxerFoo Год назад

It looked promising for the Twin Cam in the mid 2000's, but it never went into production.

@chemdog70able Год назад

Had an old friends uncle that had Dyna with those heads but he also did some bottom end work. That bike would scoot. He got them of a friend that dragged bikes. That was years ago nit I think he still has the bike.

@GixxerFoo Год назад

That would be awesome if he still had that bike with those heads today! There's not many examples of them running out there still today.

@USARAY1947 Год назад

50+ years ago Stan Dishong of Dishon's Cycle Shop in Vallejo, Calif. bforlt a working overhead cam setup on his drag bike. I saw it start up and run and it reved quicker than any Harley I've ever heard.

@geraldwest3428 Год назад

Very interesting info I never knew...thanks! Think its best to stick with big bore kits for the sporties like Hammer Performance 1275 or the S&S Hooligan Kit. Keep rocking, GixxerFoo!

@Bahlzeron Год назад

These are Big Twin Evo heads, not for the Sportster Evo.

@hellbilly6532 Год назад

I had forgot about these

@angelsierra1988 Год назад

Great Video !!!

@GixxerFoo Год назад

Thank you! I appreciate the support!

@upsidedowndog1256 Год назад

I remember seeing these in Cycle World. Seemed like a great idea. Think about engine types though. Torque production trumps HP, like in top fuel dragsters. They use 2 valves and make over 10K HP. But the torque is what gets them to 1000' quick.

@rollandklontz Год назад

Not sure what all it entails, but there are a few builders putting m8 heads on evo's

@GixxerFoo Год назад

I'm sure that's gonna take some machining and a lot of ingenuity. That's the first I've heard of this, I'll have to dig into that!

@347mav3 Год назад

My 2002 Indian Scout came with an S&S Evo style engine that made 90hp to the tire with minimal tuning.

@GixxerFoo Год назад

Those are some really trick bikes you don't see every day!

@347mav3 Год назад

@@GixxerFoo Thanks. I'm pretty proud of mine.

@vernegibb621 Год назад

I remember them heads . Why I did not want them to get the hp out of them you had to be at 5000 + rpm and with the spark plugs placement you would have to drill holes in the frame to change them or pull the heads.

@GixxerFoo Год назад

Honestly wide open throttle was the only place they really shined!

@williamrizzo1285 Год назад

This is the first time hearing this, I wonder what the rocker arms look like?

@GixxerFoo Год назад

They are proprietary to the units, if you broke one I don't know what you would do today for a replacement.

@nigesbasementworkshop9541 20 дней назад

They are a work of art

@michaelmitchell5909 Год назад

I'm hoping to one day to own a m8 114 road king special

@GixxerFoo Год назад

I gotta say Harley-Davidson knocked it out of the park on that one! A friend at work has one and it's a slick bike!

@MicahBell_1860 Год назад

Seen these on drag bikes here in Australia

@leighfisk1344 Год назад

Sputhe had a 4 valve head for sportsters in the late 70s 80s

@GixxerFoo Год назад

That's interesting! I'll have to check into that and see if there's any of those still floating around!

@okiemale1589 Год назад

😎👍 Big thumbs up...

@GixxerFoo Год назад

Thank you! Cheers!

@PotatoeJoe69 11 месяцев назад

'96-'99 Evo's are easily the best bug twin engine Harley has ever made, hands down. They sound great, they look great, they run great, they're reliable -- I feel drawn to sell my '23 FXST and buy an old Evo Softail.

@leonardstanford1877 Год назад

Rivera the now out of business belt drive co also marketed a set of 4 valve heads for EVO engines ! Your exactly right for the money it was an expensive way to make a fast EVO motor ! They are interesting though ! Let's see more high performance stuff that are not bolt on bullshit !

@leonardstanford1877 Год назад

Do a little research & do a piece on Fuelings 3 cylinder Dynas they built ! I saw one at Sturgis probably 15 years back pretty cool !

@GixxerFoo Год назад

I've seen that 3 cylinder floating around there on the internet, they also make a 3 valve head for the new M8's. Curious idea since it's already a 4 valve but Indian's Thunderstroke is a 3 valve head.

@GixxerFoo Год назад

You can get wild going beyond the bolt ons, I guess technically a stroker crank is a bolt on albeit just much more time consuming.

@leonardstanford1877 Год назад

@@GixxerFoo Fueling claims the 3 valve head flows more air then the stock M8 head !

@WHA2319 Год назад

So i bought a 1998 Fatboy from my grandpa and he has had it since new with pretty good maintenance and a lot of miles I got it when it had 53k and it now has almost 58k I've done oil and and whatnot but what kind of things need checked over on these things? What can I do do get this thing running a little better and maybe get some more power? it starts a litttle rough and backfires like crazy when downshifting and has what i believe are Vance and Hines bigshots on it. Dont really want to do a big bore or anything wild but it seems like it could run a bit better than it does now

@evelynwilson7586 Год назад

Just watched your video on Twin cam 103 bolt in cams, noticed you didn’t have the S&S M103, your input would be appreciated. D W

@vaughnmcmillan8400 Год назад

What I'd be interested in, is a turbo kit for a Merch 120.

@Pork-Chopper Год назад

Back in the 70's early 80's Rivera Engineering made 4 valve heads for Shovelhead engines. They called them "Fuelie Heads". It required the builder to buy 4 extra rocker arms, cut them in half n also cut in half the original rocker arms and have them matched up n precisely welded up n machined to fit the fuelie heads. There were a coupla drag bikes built this way but the concept never took off because of the extra cutting n machining involved in the process and it was not cost effective for most of us, they cost and "arm" and a leg to start with then you had to do all this extra work on the rockers. The idea was good, but the cost was waay to high for most of us. The idea never died as we can see Grampa Harley brought the idea back in the M8's. Yes, they touted it as something new, but the idea behind it was decades old... What's old is new, What's new is old .. 😳

@DavidMcCulloch-fw5gt 3 месяца назад

I have an evo with these heads on them and it is a daily driver

@GixxerFoo 3 месяца назад

Really?! That's awesome! Those are actually really rare and hard to find!

@DavidMcCulloch-fw5gt 3 месяца назад

Been running them for about 20 years now. They are reliable but needed some re engineering on them. I run 2 mikuni 38mm snowmobile carbs on it. Never had it on a dyno but it is a quick and fun bike to ride. Of course it's far from stock

@aquahombre Год назад

Didn't Edelbrock make a 4 valve head for the EVO also?

@GixxerFoo Год назад

I don't recall if they made a 4 valve, but they made some awesome off the shelf bolt on 2 valve heads that were very popular.

@m.f.m.67 Месяц назад

You can hop a Harley engine up to the point where you've made a nice two-cylinder hand-grenade. Stock is Trick.

@GixxerFoo Месяц назад

It's easy to do especially if you go to far!

@kurtfoulke5130 Год назад

I've seen them on the Evo & Sportster engine.

@GixxerFoo Год назад

On the Sportster? I have never even heard of anyone putting them on the Sportster motor, that could be interesting with a 1275 kit from Hammer.

@kurtfoulke5130 Год назад

@@GixxerFoo Harley Davidson had 8 valve racing engines back in the teens. The 4 valve Sportster heads that I remember were not Fueling/Rivera, back in the 90's there was an aftermarket co. with the next big thing popping up every week. There is now a lot of energy being spent developing 3 valve heads for the M8.

@owenbruce4120 Год назад

If it ain't broke don't fix it or you'll go broke, sticking with a stock 95, never seen 4 valve heads

@GixxerFoo Год назад

I still think good head work on the 2 valve heads would do you plenty, unless you're drag racing the 4 valve head wouldn't do much for you.

@lonessome1384 Год назад

I have the whole motor and an extra set of heads and 2 set's of pipes

@davidefland1985 Год назад

I’ve always wondered

@GixxerFoo Год назад

There was 4 valve big twins before the factory made it happen!

@rockyrauf2529 Год назад

Tell me something please. Give you opinion on the Ultima engines. Thanks.

@GixxerFoo Год назад

Ultima I have seen a lot of at the drag strip with guys beating the hell out of them. I would choose Ultima over Revtech, most people either love them or hate them but they do have a good warranty. They've done a lot of R&D and creating their own cases and even crank pins to prevent fly wheel shift. Those motors put down serious power, the more streetable smaller inch engines I would say are very reliable. You get the big one with 140 horse that is what it is, I don't think they warranty that one for more than 30 days.

@roadrunner681 Год назад

oh, so these are what i found in old man dutch's place. He had a set of them, but they were missing pieces. there sitting in a oily bag on the shelf, maybe i can get him to sell them to me.

@GixxerFoo Год назад

Really?! I would try and get those if you can, if you got the rocker arms you're in business. Valves, keepers, seats, springs that can all be sourced but the rockers are proprietary to those heads.

@roadrunner681 Год назад

@@GixxerFoo i think there missing, when i get the old man on his feet ill see if we can find them. all i have to say is ex wife, i hope we find them.

@Indobiker61 9 месяцев назад

I know a Guy that has his own museum in his bike/ car store. Hé bought a few price winning bikes from Daytona. One of them has a set of 4 valve heads on it.... Don't know if the bike runs as its Just part of the museum.

@jackthebagger7589 Год назад

I put a set on my 1988 Tour Glide , they were stoopid money , I could be wrong , but I wanna say they were around $3500 , for the money I would have been better off building a bullet proof stroker .. Harley cases were not up to the task , Axtell or S&S would have been better .. I think after my trials with them , that if there was a flaw in the design , I believe the valves were too big for the motor ..

@herman58100 Год назад

No , never owned a bike with that set up. Seriously considering picking up an Evo however....

@GixxerFoo Год назад

Evo is one the greatest engines of all time from Harley. You could even still get a long block, factory rebuilt all fresh up through 2013.

@sum_wak_fuk6808 Год назад

Would a set of 4 valve heads fit a merch performance motor?

@leonardstanford1877 Год назад

No the bolt pattern on the heads is way smaller then the 4&1/4 bore of a Merch !

@E-Glide 5 месяцев назад

Harley and Indian had 4 valve heads......yes......100 years ago

@positivelynegative9149 Год назад

Is the 4 valves why the M8 feels like crap?

@GixxerFoo Год назад

The 4 valves breathe better no doubt, but the M8 just doesn't have the sound the Evo had with the 4 valve head.

@zavlo72 Год назад

Basically, Basically, Basically, Basically, God Damn it. There are other words. No more Basically!

@GixxerFoo Год назад

I'm looking for some!

@zavlo72 Год назад

@@GixxerFoo Try essentially, mostly. mainly. primarily. largely. chiefly. predominantly. generally. principally. I'm here for you.

@MicahBell_1860 Год назад

@@zavlo72 basically it looks like your dictionary is too😂

@frankmarkovcijr5459 Год назад

Doesn't a 4-valve hedge take power away from the bottom end?

@GixxerFoo Год назад

The 4 valve head wouldn't hurt your bottom end, most of that power is really determined in your choice of exhaust.

@uncountedvoter9449 Год назад

Yeah, I'm getting 100hp/106q out of my 80in so it would need to give me at least 110 for it to be worth while.

@GixxerFoo Год назад

That's some damn good numbers out of a 80 inch Evo! A set of those heads sounds like it would work well with your setup!

@uncountedvoter9449 Год назад

@@GixxerFoo That's with Branch & O'Keefe heads, reduced piston squish, Wood W6H cam, TH manifold, and Mikuni carb. The tuner was able to pull a little more out of it but set it rich to keep the heat down.

@stephendrake8145 9 месяцев назад

It is sad and a major loss to V-Twin motorcycling with the passing of Jim Fueling and John Britten at such young ages & the height of their creative genius...

@bill392 Год назад

Twice as much valve face surface to burn or leak, twice as many springs to compress, I don't know, sounds a lot less reliable, especially on an EVO that's not even a balanced motor. Besides, adding a lot of compression and power requires changing to forged pistons, connecting rods, stronger pushrods, etc. Maybe it makes sense for racing... but not really, I mean who races a pushrod motor anymore. For a lot less money I can buy a used Softail with a 107 M8, stage-1 it, and call it a day. Don't get me wrong, I love my 1200 EVO but it is what it is and I'm just fine with that. Nothing wrong with an S&S kit and a tune, still reliable enough. Anything beyond that is getting a bit sketchy, sh!t's gonna break.

@GixxerFoo Год назад

The heads and the valve train were very reliable, but like you mentioned you're playing with fire on the factory cases increasing compression and getting really wild.

@kennethwise7108 9 месяцев назад

Probably has a 7mm or smaller valve stem too. Screw that...

@pcontiman Год назад

Gixxer deep dive...... Too deep 4 me

@GixxerFoo Год назад

This is going way back in the Harley-Davidson lore, there were some really trick parts out there in the 90's and early 2000's.

@jerrybigrig9475 Год назад

😎👍😎

@donwaltman4276 Год назад

Are you describing a 4 bbl carb for a motorcycle?

@GixxerFoo Год назад

You could run two carbs with these heads, the one on the right handled idle, cruise and midrange but at wide open throttle the other carb on the left opened up just like a vacuum secondary on a 4 barrel per say.

@donwaltman4276 Год назад

I really miss carburetors!

@bigpowerhouse11 Год назад

Changing spark plugs in those heads must've been a real b**** lol

@darrenlingerfelt5879 Год назад

😎👍👍

@xlr8r3VA Год назад

Wow, this is my first time hearing about these heads. Sounds impressive, but need a better business model. They should have been thinking long term and looking at sales volume instead of profit per set. Low cost volume always wins. Hey, maybe China will start making them. LOL!!!

@GixxerFoo Год назад

I wouldn't be shocked if you could order a 4 valve knock off head right out of China. May work, may not, may for a little while and then cost a motor, always a risk using China made parts.

@1AXMRDR Год назад

Nope, never seen them.

@MoeLarrycurly1 Год назад

Nope never seen any.. they might be like hens teeth 🐥

@GixxerFoo Год назад

I've always heard of them, knew they existed but never have I seen one on a street bike. I've seen custom hand built 4 valve heads for drag bikes at the races.

@MoeLarrycurly1 Год назад

@@GixxerFoo 👍🏍️

@pinslayer4579 Год назад

Hardly Dependable's claim to fame is tractor like torque. Four valve heads increase flow for higher R.P.M. engines. 6 k rev's out of a long stroke turdly Ferguson is no reason to double the amount of parts thrashin around above that diesel like stroke. Ya can't polish a turd. And it will most likely increase price's to over 50 k.

@GixxerFoo Год назад

I agree the 4 valve head would really shine at wide open throttle, that's why the drag racers loved those heads. But a good port job on the two valve head would give you more than you wanted for the street.

@jurleyjunakson1 8 месяцев назад

Chepper and better buy yamaha xvs 1900

@Smith686plus Год назад

I would love to see a set of these made for the 1203 sporty motor.

@GixxerFoo Год назад

I keep hearing people say they have seen these heads on a Sportster, I never even heard of that only the big twin. I am going to have to ask around about that some more.

@ericalger5003 Год назад

As an added note, my ZX11 back in the day NEVER LOST TO A HARLEY. Doesn't really matter what you do to a Harley they're still going to be slow.

@johnbarrett7534 Год назад

You haven't ridden the new Sportster S or the Pan American yet.

@ericalger5003 Год назад

@@johnbarrett7534 My 21 Ninja 1000SX devours those regularly.

@johnbarrett7534 Год назад

While not the fastest, they are far from slow. I am running mid 10's at Bithlo dragstrip with the Sportster S.

@ericalger5003 Год назад

@@johnbarrett7534 You obviously have never ridden something genuinely fast like a ZX14R, Busa, ZX10R, R1, CBR1000R, GSXR1000, H2. If you have then you WOULD NOT be impressed by ANYTHING Harley has EVER made.

@ericalger5003 Год назад

@@johnbarrett7534 Yawn. Mid 10s. Ok. Wow.