Speedway Motors Tech Talk GM 461 Double Hump Chevy SBC Aluminum Heads 

Crazy cuz it still prolly made 340hp🤣

@@PHILLY214L79 327 SBC made 350hp from the factory. I’m sure this guy was pushing 400whp in a 3000 pound car.

@@aidanmoore8768 that comment up there^^ nah man they had 165-170cc Intake runners…no way in hell it would make 400 to the tire that’s like 450+ at the crank….a 327 with fuelie heads and a bump in compression w a nice cam can make a lil over 1hp per cubic inch why I said 340hp maaaaybe 360

The production 1965-68 327s basically had what he’s sayin^^ all except the .060 over and solid lifters lol so he mighta made 360?…he’ll the Vettes had solid lifters 🤣🤣🤣

@@PHILLY214 either way, 360hp is still enough to have some fun with.

I've got a matching set on my 327 in my 55 Bel air hardtop , it runs very well. I do wish they had the alternator holes for the mounting bracket. But they look old school 👍

@Duke Of Prunes Some of the cast alum materials make that easier said than it is done. We tried and wrecked a head here. It actually takes a CNC bore machine to get it right. Most of the Alum heads are a much harder Alum than one would think they are made of which makes modifying em a challenge.

A set of Vortec heads outflow double humps and with a modern combustion chamber make much better power. Double Hump heads are 60's technology, compared to modern heads they suck!

Cast Iron can also be painted. No advantage there. I agree aluminum is better in most every other way, though... .

@@danboren6567 Many stock class roundy round race cars have to use the double hump heads, though. There were no stock class race cars running Vortec heads in 1965 on a Malibu SS, or a Corvette!!!

Not all some were screw in n from factory

When I called Speedway they told me the heads were cast in China.

@@inmygarage_kenmbig surprise there! The flow data on the Trick Flow DHC heads show they have about 20cfm more at 0.500 lift than these.

trick flow has better flowing double humps, they even have a 200cc version coming. speedway probably sells them...

Shoot for the Moon, I love your thinking....

probably need to weld up head, add 2.08 splayed valves. Totally these can not do that.

I would assume if these are a hit they will do that.

Trick flow builds a similar head. DHV175 which can be ordered with or without accessory holes.

The whole purpose of these is to "look", vintage. Early versions did not have end holes. I have 1964 DH heads and robbed all of the parts from an early Malibu so I could keep it stock looking. GM brackets and pulleys are always the way to go, they always fit stock.

LS’s suck anyway.

Of course not, I had camel back heads on my 327 in a 70 chevelle, it is the vintage look they are going for. If someone wants holes they are available.

@@bryandouglass9997 You can also drill and tap your own. I did this successfully on a set of CI double hump castings off a 1963 Corvette. I mocked up the assembly with the accessory brackets, used liquid white Teflon pipe sealer, and never had a leak. I used hard washers of one thickness, and different thickness washers as shims. It really isn't that difficult. CI drills and taps easily. Actually, a little known fact; you need no tapping oil or lube when tapping CI. It has a lot of graphite in it. Oil not needed... .

Trick Flow also makes a great set of double hump aluminum heads that come with the accessory bolt holes.

@@milojanis4901 ...people dont try this....1970 DH's has the holes

You are missing the point.

I built a 327 with them, here's a couple videos of it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-XivdjwuUKvg.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-tshd34BDDiY.html

$650 per head

@@imright3074 $650 per head is fully assembled with all high performance components, plus a 3 angle valve job.

With all the stroker and ls craze, many don't even know about the 327. Damn good little engine. Specially with the 350 horse cam, roller tips and a well tuned carb.

I had a small journal 327 bored 60 with double hump heads, flat top pistons, crane solid lift camshaft and that little motor was a beast. I had it in a big 70 chevelle and it would get. Miss that car and engine.

@@rosco664 Imagine how it would have run in an F body. Less weight, more ZOOM... lol

@@Future-Preps35 I know where they are. I do remember the x head having a bigger port. When I built them, there was brodix and brownfield or Chevrolet. I had a pair of 292 heads, that was it in the day. 292 I guess was the first over the counter, 190cc port ex raised .40 no heat riser and of course angle plug. Crane cams would port them, hence the crane head. Long time ago.

We've seen tests on stock 113's that flowed around 195 cfm @ .500" lift on the intake and around 151 cfm @ .500" lift on the exhaust. The Speedway Motors double hump heads flow 232 cfm @ .500" intake and 173 cfm @ .500" lift on the exhaust. There are lots of variables here, but in general the Speedway Motors head will have bigger valves (2.02/1.60 vs. 1.94/1.50) and bigger chambers (64cc vs. 55.9cc) when compared to a stock L98 113. The L98 113 castings can be ported and stuffed with larger valves to flow in the same range as our double hump heads, but they won't have the same power potential due to the older chamber design. Also, note that the double hump heads are not drilled for accessory brackets, by design.

How much

@@PROSTREETS1096 like to get 800

Where you located

@@PROSTREETS1096 TX

They do make them with the holes also

@@jamoshotrod the devil you say....I looked and looked, missed it I guess.....did you see a part number? Thanks for the info.....

@@mikef-gi2dg I had the 041's with moderate porting and 2.02's and 1.60 and that set did have the accessory holes on them.SBC ran amazing.

@@arodderz i still got a set of 041,and 461 never rebuilt them, going to buy new modern stuff, the speedway stuff looked good, not concerned with the nostalga look. There is a bunch of modern new stuff in the $900 to $1600 range.

@@mikef-gi2dg I hear you. Yes, modern heads are the way to go. I went with the Afr 195cc heads and absolutely love them.

Don't you mean power pack?

@@nebrrex6910 no, power pack heads had a rectangular shaped casting Mark with a point in the middle of it

@@jeffcolt9185 I was referring to the year. The 327 came out in '62. In '61 it was just the 283 and the power pack heads.

What about Pyramid Heads - Double Hump comparison ?

Well...... in 1961..... you could buy a new 327 equipped 1962 model Chevrolet....... sooooooo yes. There’s 327 parts with 1961 date codes.

Sooooooooooooooooooooooooom LOL, I hate that too when someone starts EVERY sentence with SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

Matt most of all of it works the same the same as any science... The issue is what the shit is made out of and how it holds up.. Most of this cheap China town reman Tuna Can shit ain't worth the cash.... Let it sit over a New England winter in an unheated garage is the main factor... Most of the shit ain't worth the junk price of what it is made out of...

When I saw the headline I was wondering the same thing. It would be nice to see a back to back comparison either on the flowbench or dyno or both. Maybe that's a good test for Richard Holdener's channel.

@@MLFranklin Alot of this stuff regardless of name is made by one of the two major companies. One's in Indiana and another in California. It seems that both Holley and Edlebrock both rely on the same two companies to make alot of their products they market.

HaHaHA!!!

.550 it shows on the website

Should, but depends what rocker you are using/thickness of head gasket/valve stem height.

The assembled aluminum double hump cylinder head currently runs $649.99 www.speedwaymotors.com/Chevy-SBC-Assembled-Aluminum-Camel-Double-Hump-461-Cylinder-Head,379621.html

@@speedwaymotors pair

Not drilled, but check out Allen grove components. He makes great brackets to run your alternator and p/s within a long water pump and no accessory holes

Yes but cast heads can handle roller set ups these tinker toys snap past the 400hp build up... They don't hold up shit not even twin Chinese hair dryers....

@@thekingsilverado9004 First laugh of the day....Thanks

Interesting never heard that before, thanks

Whaaaaat????????????????

bullshit

But what about the Weight ?

@@jimmysapien9961 I’ll take a few more pounds over it constantly overheating engine

And EQ heads aren’t Chinese junk.

Depends on the cam and spring pressures/weight of the push rods/rockers.

They use a very thin head gasket; can you use one that is twice as thick to avoid clearance problems with stock L79 pop up pistons?

Are you asking permission haha, as long as its high temp paint I dont see why not

No such thing as low end torque in a 302, at least compared to other SB Chevy mills. Mid range to high rpm motor, all day long. lol

P.S. You're wanting low end torque, and you're asking about 2.05" inrake valves? Dude... smh

Don't think the 11:1 high compression stock pistons will work with this small combustion chamber shape but I could be wrong.

Yeah, these are still a little behind Vortec with flow numbers, but they're a much better set of heads (durability wise), ready for .550 lift with screw in rockers.

@port nut THE CHEVY 396 BIG BLOCK CAME FROM THE OLD CHRYSLER 318 POLY ANGEL ENGINE PRODUCED FROM THE MID 1950'S UNTIL THE MID 1960'S. SECONDLY THE CLEVELAND WAS THE ULTIMATE IN POLY ANGLE HEAD DESIGN IT IS STATE OF THE ART. IN THEORY ALL THE BIG BLOCK CHEVY WAS IS SLAYED VALVE. THE REST OF THE HEAD ARCHITECTURE WAS POOR. BECAUSE YOU SPLAY A VALVE MAKES IT BETTER, THAT ALL DEPENDS

@@suzukiltz8902 1970 WAS THE LAST YEAR UNTIL EMISSIONS CAME AND KILLED EVERYTHING FOR ALL MANUFACTURERS.

Frank, I think you meant 351 Cleveland, not 351 Windsor...

@@stephenkeebler732 THE STOCK 4V 351 CLEVELAND FLOWED 275CFM. YOU ARE OVER LOOKING WHAT I AM STRESSING HERE. I AM STRESSING THE FACT THAT THOSE STOCK PRODUCTION 351 WINDSOR HEADS, A NONE RACE ORIENTATED HEAD OFF A STANDARD PRODUCTION VEHICLE WITH SMALLER VALVES AND INTAKE RUNNERS. FLOWED JUST AS GOOD AS CHEVY'S ALL OUT PRODUCTION RACE HEAD THE FUELIE 2.02. THE CLOSEST FORD HEAD IN FLOW TO THE CHEVY 2.02 TODAY IS THE GT-40 HEAD WHICH EXPLORERS USED. THEY FLOW 195 AND THE FUELIE FLOWED 200 CFM. LOOK HOW FAR AHEAD FORD WAS THEN CHEVY. BY ENGINEERING THEY WERE ABLE TO DESIGN A HEAD WITH SMALLER VALVES AND RUNNERS TO FLOW LIKE CHEVY'S BEST THE FUELIE HEAD. THIS IS THE REASON GM COPIED THE WINDSOR HEAD DESIGN WHEN THEY CREATED THE LS. THEY JUST RAISED THE INTAKE PORTS LIKE THE AFTER MARKET COMPANIES DID TO PRODUCED A RACE HEAD FORD THE SMALL BLOCK FORD. A CONCEPT FROM THE FORD 427 HIGH RISER GIVING A STRAIGHT SHOT INTO THE CYLINDER FOR GREATER FLOW. FOR YEARS YOU COULDN'T GET A RACE HEAD FOR A FORD WHILE THE AFTERMARKET PRODUCED COUNTLESS RACE HEADS FOR THE SMALL BLOCK CHEVY. IT WAS ONLY UNTIL 1987 WHEN TRICK FLOW STARTED MAKING A RACE HEAD FOR IT, THE FIRST ONE IN HISTORY. THE QUESTION HERE IS WHY DID IT TAKE CLOSE TO 30 YEARS TO PRODUCE A RACE HEAD FOR THE SMALL BLOCK FORD?????????

@@stephenkeebler732 Stephen. I think Frank might be getting a bit confused.

Doubt it.

Well 😎 that's just a negative comment... These heads will far exceed..They weren't trying to be 100 percent copy only improve,and they accomplished that in Spades...

You have some dinosaur garbage, now they’re not needed

Thanks! Here is the link for the bare cylinder heads: www.speedwaymotors.com/Chevy-SBC-V8-Bare-Aluminum-Camel-Double-Hump-461-Cylinder-Head,379620.html

And crack......

Pyramid Heads ?

read the casting date, but they must be 1970 or newer with the bolt holes. large open chambers "76cc are not hipo anything unless they came with 2.02's ...l82 vette

@@gtbarnes11 I'll have to take note of the whole casting number the next time I have the valve covers off for a lash resetting. I know they're 64cc chambers and I knocked it down when I surfaced the decks .010

The combustion chamber volume on these is 64cc.

@@speedwaymotors Just 10cc larger than the the combustion chamber that this head copied, the Ford 289.

@@nebrrex6910 Copied? Ford has a different layout....

Like the 90 OHV pushrod v8 in 1955 that everybody copied and still does to this day.

Your bro dix heads don't have the double humps fr the era look for street rodders, that the reason for these

drilled and undrilled versions are sold.

trick "307" lol lmao

@@billtribble7197 If you have found some hp 307 pistons, let me know. I like the little 307's.

@@mikef-gi2dg .i never owned a 307 . never heard of any hy PO parts for them

@@billtribble7197 way back in the day trw used to sell forged flat top like the l2256 for 350's and a piston for 283''s as well...long ago, for 307's. I inherited a 72 2bbl 307, 110,000 miles, from a wrecked nova, I re-ringed with bearings, slapped on a performer manifold and cam, hei ignition with the msd module, holley 1850 and headers, 8.5 pump gas beater. I foot braked that B, for 13 or 14 years in multiple plain jane cars. It didn't have the bottom end like a 350, but it would spin to 6500, no problem, with self ported gm993 heads. It was a free motor, deadly consistent foot brake street car motor, never broke any parts, just wore it out with appx, 5000 passes down the strip on 87 octane gas oh and it won many rounds and money, and I was a lousy foot driver half of the time. My other motors were 305's with the same parts, same results, super dirt cheap, round winners. I am going to rebuilt the 307, flat top hyper pistons, or regular cast ones, with 305 vortec heads. I got all this stuff taking up space, and nobody's going to buy it from me. It runs what it runs, super dirt cheap, and when someone askes, and I say 307 they think I am lying. Especially when that can't catch you at the finish stripe, with out going way under.

Good for u my friend. I saw a 1st gen. Nova that took 1st place $$ with 6 banger week after week. they got such a head start. u couldn't catch it. love what u love

It would depend on how much valve lift the cam has. They should work, but you'll need to check clearance before final assembly happens.

@@speedwaymotors so what is the most lift you can use on a 283? Thanks!

283 has a smaller bore. I wouldn't go any bigger than 1.94" intake valves to be safe

Accessory holes alone would make them better.

Yup.. junk.

The price varies, but you can click on these links to see what they are today. Assembled heads: www.speedwaymotors.com/Chevy-SBC-Assembled-Aluminum-Camel-Double-Hump-461-Cylinder-Head,379621.html Bare heads: www.speedwaymotors.com/Chevy-SBC-V8-Bare-Aluminum-Camel-Double-Hump-461-Cylinder-Head,379620.html

Not the earlier castings, and those were among the best of the camel hump heads. I know, because I once owned a 327 with the early heads with 2.02 intake valves. There were NO accessory holes. Had it in a sweet '66 Chevy short wheelbase fleetside, full custom cab, with original 3.73 posi rear end. Gorgeous truck. ( Truck originally came with a 283. ) Also had a double roller timing chain & gear, 4" Holly intake & 750 single pumper. It would only run oh high test, and ran like a bat out of hell. I'm still kicking myself for selling that truck decades ago.

You’ve been laid because of the type of cylinder head you were running on your car?

@@oe542 he did say you can enjoy the Vortec accessory holes. 🤣🤣🤣🤣

If he's dragging a set of Double Hump heads through a Trailer Park, he's got other issues...

Might as well run AFR

The Trick Flow DHC heads are smoother from the deck to the rail and much better disguised that raised rail.

They don't look like Double Hump heads to me, and I'm mostly a Ford Guy...

Originally most accessories had steel brackets to hold them that mounted externally to simplify manufacturing the cast components. Even early blocks didnt have side motor mounts they mounted at the front. As for the exhaust. 3in exits on rams horn style exhausts like that would kill velocity on N/A applications. Most N/A sbc dont need any more than 2.25 exhaust. Going too big can reduce velocity and kill power in your rpm range you use the most.

Absolutely incorrect!!! Aluminum has far superior thermal dispersion properties than does CI. Whatever it was that caused you to run hotter was definitely NOT the aluminum heads. They have every advantage known to man over CI. That's why almost every V8 made now has them. Motorcycles that used air cooling, and made 1-1/2-2 hp per cubic inch haven't used CI for head manufacturing since the 1960s, unless you count H-D, which is another story entirely!

yea your head gaskets were l;eaking. pro comp or something cheap, chineese?

@@jeffallen3382 Go try it and find out for yourselfSomebody told me that this would happen if you put aluminum heads on a small block it would overheat I did not believe them I went ahead and did it anyway should have the engine overheated with those aluminum heads put cast-iron heads back on and everything was fine

@@jeffallen3382 You might be ase certified but you don’t understand metals aluminum dissipates heat a whole lot faster the cast iron, therefore having to raise compression or drop chamber size when going to aluminum from cast iron because of the heat dissipation of the aluminum you will lose power so how did motor run hot just from swapping heads did you use the correct headgasket?

@@jeffallen3382 I responded to the wrong person but tell me where I was wrong.

They must be