292 CLIFFORD INTAKE UPGRADE 

Maybe only 20 HP, but the bling of that Clifford is good for the self esteem of that little Six.

Absolutely love the 292 content

Really love this series. Some of the other "other guys" are kind of a no brainier.... The Buick, Pontiac, Cleveland stuff, etc. They all made massive power in their day. This little guy.... He was worked, tortured, pushed... The love he ever got was an oil change... If that!!! Great stuff you're doing. I can't wait to see a 300 up there. I know I'm not alone. 👍

Can't wait to see the cam/head upgrades

I really want to see how Tom's intake manifold does. I love watching you mess with this 292 and it's fun to see how she does

Next up Buick straight 8.

now for a nice rebuild, higher compression mild port and mild cam

Now you need to do a similar test with a 300 cu inch Ford I6.

I'm finding this more interesting than most engines.

I really like this series. Most of the time I would be bored with this little power 😜

Man I can't wait to see how that 292 does with a Comp cam, a good port and polish on the head, maybe some oversized valves, that Clifford intake, and that 650 Holley. I think it'll be a strong inline six.

Some of the engines may be old but this content never gets old...please keep these tests coming!👍👍😎😎

Amen, life is about how well you deal with problems/ setbacks. Congrats on the results, keep em coming

I've never owned a chevy 6 but this is great tech Mr Holdener!!!!! A great hands-on fabrication and dyno experiment!!!! Thank You Sir!!!!

You're the best, Richard! Thanks for these very informative videos.

All eye openers! I'm all ls but I was raised on a lot if these "other guys" and this Channel has been changing my mind on what they could take!

I had 1970 nova straight 6 with 2 speed bought 1800 dollars in 1996 I like the stockness but to get it to burn out I told my pen pal from Australia what I like to do get it to burn out and keep it stock. My pen pal got me Aussie speed intake and I purchased a Paxson super charger kit. It sounded like a mad tractor but it would do burn outs for ever.

Bless you for making these videos! So helpful and in depth

I love the other guys series, very cool stuff. Thanks for the continued testing.

Love too see this kinda testing. Back in the ‘80’s-early ‘90’s I ran a Chevy 6 with the Clifford stuff and a comp cam.

All petrol heads love the sound of a revving engine! Dyno runs Rock! Keep them coming 👌

Great videos. Thanks Richard

I’m running a Clifford intake, 500cfm 4bbl eddie, and headman long tube headers on my ‘80 cj5’s 258 I6. Idk what it’s making but it has no problem turning over 33 inch tires. You are the man Rich!!!

I told a couple mechanic friends about you and everyone who sees your stuff is impressed. You're the man Rich!

Great video Richard thanks, I love the little underdog 292!

If gorrilla tape works as a gasket then I'm about to save a pile of cash

Great info for the "Straight 6 Mix" crew💪🏾💪🏼💪🏻

Richard, great work!!! Keep it going !! With a turbo, cam cylinder head modded, ported, 1.84" intake 1.6" exhaust, intake lump port bolt in, (helps the short turn radius), should make 500 ft lbs with enough boost pressure about 20-25 PSI. Crank can take it, rods are a bit weak (they are forged) to rev high, 4.120" stroke, main cap for every rod, strong enough. I believe a better damper is needed to rev higher. Harmonics really wreak havoc on these 6 cylinders. Too much torsional vibrations takes away a lot of HP, need to keep that in check. It is a lower reving engine as compared to a 194,230, 250 CI engine. Can't wait for more videos!

Great job Haven’t always liked the inliners but I’ve gained an appreciation for them over the last few years BRING BACK THE INLINES

By far this is one of the more useful dyno videos I've seen for the inline 292. My guess is headers, intake, carb and cam are all needed to make a real improvement. Improving head flow is gonna cost some real money but it would build on what ever is done before. Improving an inline is gonna cost you. Thank you Richard.

I love seeing projects like this. Trying to make gains with oddball engine and such, very cool!

The ford inline 6 4.9 needs to be in your hands on the dyno

Keep up tbe good work, love your videos, tests that i would actually like to see without my own dyno

Thanks Richard, another Awesome video. A 12 percent increase from an easy bolt on upgrade is always a win. At a low starting point of 145 12 percent is something that you would definitely feel driving this on the road. It was also great that David Frieburger gave you and your RU-vid channel a shout out on the latest episode of Engine Masters. Can't wait for the cylinder head and cam upgrades. Cheers. 👍

Really cool series , thanks!

I would like to see a ford 300i 6

I love Clifford. I really want to see you do a jeep 258 with their parts

I have one on a Chevy 261 6 using a EFI Throttle body. It is a gem. The Clifford products I have purchased are all top quality well designed and built.

This motor your doing is the bigger brother of our(Australian) Holden 6. Our 202 has been developed so much over the years that now some are doing 450na and 600+ boosted. Love ya work.

I had a 76 Nova back in the day with a 250 6cyl , 292 dump truck exhaust manifold , a Offy intake with a 390 cfm Holley and a curved distributor . Sounds crazy but it won many a race WAY OUT of its imagined abilities . Newer Trans Ams , Z-28s , 302 Mustangs all stock got a view of my tail lights . I never could understand why .......???

Thanks another great video Dwayne nz.

I have just rebuilt my 230 inline 6, offy intake, split headers from Tom's 12 bolt, 4 bbl progressive carb modified by Tom to a 3 bbl and a R.V. cam with porter mufflers. It sounds amazing.

Lot's of hard work, so full marks. Can't say the big 6 does much for me but if one has one, that then becomes a whole different ball game. Good cheer, to all engine fixers out there!

I got a 1927 Ford I put a a Clifford intake with a 450 carburetor and headers it runs really fine I've never had it done it's got a 350 turbo automatic anyway I love it runs great thanks for all the info

Can't wait for the efi ford 300 series of tests😁😁 The largest group of straight six enthusiasts would have to be the jeep 6 guys tho. A 4.0 amc/jeep build would be fantastic. We ran a stock, rebuilt 4.0 cherokee 2wd automatic on our dynojet. Rated at 170hp flywheel, it made 145 dynojet wheel hp. Kind of impressive. Looking at the 4.0 cylinder head ports vs the efi ford 300, and the chevy 250/292 head tells the whole story.

Good Job Richard...👍 i enjoy waching the Other Guys tests...Ive done Similar test with the 4.0 Liter Jeep ...I made close to 200hp...to the point where i started breaking everything in the Drivetrain...Trans...Drive Shaft...Diff...even broke the Axles...lol. Straight Sixes make good Power and Excellent Torque...🇺🇸

I love the canned techno. I'm glad you won.

Great to see other than V8s all the time. Maybe an old Iron Duke 4 banger sometime?

Would be cool to have been able to get an aluminum Sissell cylinder head and better cam for that thing!

The Ford 300 6 cylinder. With upgraded head and cam with the Clifford intake 4 barrel and headers. I had a Jasper rebuilt that I wanted to do to my 1981 F 100. But a new house and life got in the way. Maybe a 302 build was what I really needed. Never know. But the Jasper rebuld engine was a good choice. I drove that truck until everything else broke or fell off of it. Donated it for a good cause. In the late 90's. Shawn.

I had a 292 a while back. That thing could pull anything. Lotsa torque!

Im running a holley 390 4 barrel, with a offenhauser intake and headman headers. 650 cfm is way to big for a 250 or 290 inline. Also running msd. Other upgrades that help these engines is a port lumps head kit that removes the bolts in the intake runners and the typical cam and larger valves.

fond memories of running a 292 six in my H/Gas '48 Anglia back in the early 60's. The bore was .060 over for 301ci which everyone thought was an eighth over 283. There were no hot rod parts other than cams and valve gear so I made my own intake manifolds ( 2 AFBs) and exhaust headers. It was competitive until some guys* cut three cylinders from two V8 heads and welded them up to provide cross flow breathing. ETs went from the low 11's to the10s overnight and the H/Gas was done for. *As I recall it was Becker & O'Connell with "The Hummer"

I'm watching this for hints on what to do with my old man's XY with a 250ci here in Australia!!

Great video

I had a 1964 C10 with a factory 230 ci. I upgraded with hooker headers and an Offenhauser 4 barrel intake with an adapter and a 500 cfm holley. I upgraded the cam to the equivalent of a big block Chevy 375 horse 396 which was 500 lift and 290 duration. Factory 3 speed and 411 gears. It ran great. I often outran v8 Mustangs and other v8 cars. It would float the valves at 100 mph. Looking back I needed more valve spring. I worked with what I had.

Great test. Be interested to see what a 0.650-0.670 lift cam would do for this engine with a 10.0:1 compression ratio and reworked head with larger valves and springs. Dreaming of a test with a Sissel twelve port head. I know, it’s a really high dollar head but the results would be interesting.

I really love straight 6 engine design. Its so good for mods.

A buddy of mine found a head off of a Blue Flame years ago and modified it to fit a 292 many years ago when such things were easy to find in the junk yard and weren't worth their weight in gold! We put it in a a 65 C10 it did real good!

Thanks for all of the Other Guys series. I’ve seen I6 engines pull dragsters into the 10s, so I’m looking forward to watching the progress

Can’t wait for the next instalment!!

love the 6cyl videos!

good stuff again!

These engines are capable of 375hp/510tq on boost. On stock block, stock crank, stock rods. Can do well over that if you want to throw half of your wallet at it. Engine, machine work, cam, intake, carb, lifters, push rod, piston, distributor upgrades with a Ebay turbo/intercooler kit will be under $4500 and should net at least 350hp.

Dang it you're making me want to pull my 250 6cyl out of the back of the shop and start hopping it up😁

Definitely needs cams and boost!! We need 292hp from this thing!!

Very entertaining BTW!

Loving this project, and in a way, this engine is the big daddy to our popular GM Holden six we ran here in Aus for many years. I'd love to see a project like this from you based on the Slant Six some day, another awesome and unique engine of the period.

292 dyno series are lovely!!!!

Small 4v for me. Cruise on the small primaries for economy. I run a 500 Carter AFB on my AMC 232, with Lunati cam, Offy intake, HEI and later exhaust manifold, and I get 21mpg. With my driving habits, lol. I'm not kind to it. Keep up the i6 content!!

I'm a year late but I loved this video!

Cool love the inline 6 stuff cant wait for the ford 300

Why do I love this 292 stuff so much???

An Edelbrock 600 will work on a WCFB style intake manifold. I replaced several on late 50's to mid 60's engines. They bolt right on using the inner bolt holes on the carb. And the throttle blades are small enough to fit in the 4 hole intakes.

I find this more interesting and entertaining than the big horsepower dyno videos. This is something the average guy would be doing out front under the tree.

Wait a Minute! I don't remember designing any intake manifolds!!!

I love stovebolt 6 cylinders I had a 58 235 inline in my 50 chevy business coupe. It was 30 over mcgurk pistons a Barry's cam Clifford true headers with a Clifford 4 barrel intake and a billet adapter I made for a weiand 144 supercharger electronic ignition and a 750 holly. It made over 300 hp and was a smash hit at car shows.. 6=8 .

Would be sweet if you could get ahold of the head/EFI system from the 4.1L/250 inline six in the Brazilian Chevy Omega and try it on the 292.

Another interesting video. Still patiently waiting for the AMC 360; with boost.

I'll interject a little science into this discussion. The flow in through carburetor or EFI is the entire flow the engine moves at maximum RPM. The flow is called "incompressible" or Bernoulli's (for the researcher who wrote equations in 1725). The valve flow efficiency impacts the number as well as displacement. The 292 cu inch engine at 5000 rpm and am 80% (0.80) would move 378 cfm of air. The cross-sectional areas of each section will govern flow velocity but as flow approaches the intake valve it becomes "compressible" and a different set of equations apply. As general rules any flow should have gentle radii; no abrupt turns. Sharp edged orifices have losses. The goal - though not always possible - is to provide as much cross-section as practical along with plenum volume... making each valve inlet seem to see an apparent infinite volume. You Don't want large turning angles either. Technically the local static pressure of the flowing gas is near the stagnation pressure. A 292 modified with lumped parameter inserts is near to 92% efficiency so rate is 479 cfm at 5500 rpm. Consequently a carburetor of 500 cfm is plenty for this engine... which what the test discovered. Friction loss does exist; turning loss; sharp edged office. As a gas dynamics I like the 12 bolt design but all these Characteristics are incremental. Everything adds a few percentage points.

That was a lot of fun! I’d like to see a carb installed that the Clifford was designed for, along with an HEI that you tailor the springs to match. I suspect there’s power hiding in the ignition that wants to be released.

Back in the day, I remember guys moving the location of the 2 bbl carb over the 4 bbl hole to get the distribution better, and turning the carb 90 degrees to how you mounted it.

Greetings from Brazil Richard. I have a 292 in my cara here with multipoint fuel injection , high compression ratio and another things. I didn't tested It at dyno but the result for me is very Nice. If tou want i Can send you the link to check. Is rising rpm Very quick

Super cool

I love it! Cant wait to see what the lump port head and cam do. What headers are you using? Pipe dia? Thanks!

We have a similar engine in Australia however only 202 cu in 3.625 bore 3.250 stroke Mine made 225hp@6200 Cam 238@.050 495 lift 110lsa 10.5 :1 comp Triple SU carbies Ran 14.8 sec 1/4 with 3.08 rear end ratio Trimatic auto 2800 stall

Awesome vid!! Still hoping for a slant six series! NA, turbo, torquestorm, Weiand 144!

I would love to see you do these same tests on the ford 300 just to see differences between the two makes there almost similar displacement same non crossflow heads you can run an older 300 with the carb or use an efi head with an offenhuaser c series 4bbrl intake. The efi head also has heart shaped combustion chambers with dual exhaust manifolds you could run twin turbos on the new head pretty easy

I am very interested in the results of this series of videos. I am currently building a 292, and need info on different parts that are available. Hope to see a lump port and cam go in that one of yours to see if it is worth the effort. Keep the cool videos coming!

I would've loved to have an extra 20 horsepower when I had my 250 straight 6 Camaro. For a rusty 6 cylinder 78 Camaro it was still a lot of fun

I run a 292 L6 in my '68 C/10 Stepside. I have Clifford headers, Offy intake, an Edelbrock 1404, 500 CFM 4 Bbl carb, HEI, I.84 Intakes, 1.6 Exhaust, .Badger cast pistons @ 030-over, Crane 260H Cam, SM465 4-Speed, and a 3.73:1 Corp 12-Bolt rear. Current engine got on the road in 2005. It is the original block, that I boxed up after going over 100,000 miles, in 1977, when I built another 292, also @ .030-over, but all Heavy Duty components from the Yuma GM dealer. Stock cam. TRW forged pistons, I ran the same Clifford headers and Offenhauser 5417 intake, but with a 390 CFM Holley 4160 R8007 4 Bbl, and points. Got 250,000 miles out of that block over 25 years.

Bring the tales of woe richard. So much ying without any yang and the whole cosmos will go out of balance!

Also I think we need merchandise once you hit 100k subscribers!

I'm putting a small 4 BBL on my 250 that came from a 4100 Cadillac engine. I think it will be perfect to get a good combo of power AND mileage. I've also got long tube headers and a lump port kit. I shall see.

Well be interesting to see it once a cam is installed to make use of the carb it can mount now.

I think the cam swap is going to be a HUGE gain!!!!

Very cool

I still believe that the triple 1 bbl intake is the best on the 292 as it's better in fuel distribution

Ah… great video! I just wish alot of these in-line 6 engines had a cross flow head

Had one of them lol grate motor for a 6 lots of low end for what it is. But I would love to see you do a stock 6lt with headers and a supercharger