302 Hemi

[Rat_Pack]

Floyd Garrett had Al Maynards Cortez Silver 69 Z with the hemi 302, crossram, JL-8, factory fiberglass hood, radio & heater delete on display for a while this past year. It may still be there...................RatPack...................

[Chevy454]

Yenko-Weslake project:

[JoeC]

Smokey Yunick discuses the Porcupine heads in his book. Trans Am racing was a fierce battle ground between Chevy and Ford. Ford had developed a Tunnel Port head for the 302 so Chevy thought they needed a big head for the 302 Chevy. The Ford head didn't work very well either.

[sYc]

I was going through the Weslake/Yenko folder and found a memo to Parnelli Jones, asking that he return his set of Weslake/Yenko heads, for the same reason as Smokey, slow progress. Also in the folder are several articles about the heads Weslake had developed for Fords, which did produce the desired results. Tom

[Norm reynolds]

Rob now that is impressive four valves per cylinder Gm now has that, Heads
were way ahead of its time ItÃs a shame that they were not to successful
with a little more work they would really perform if any thing they
ARE impressive [img]/ubbthreads/images/icons/wink.gif[/img] [img]/ubbthreads/images/icons/smile.gif[/img]
Norm

[JTH74]

Would these heads bolt on to the standard 302 block or was it a completely and totally different engine?

[Leonard]

Info from: "The 1969 Camaro Reference book" by John R. Hooper. The short block was identical to the Z28 302 short block. (block,crank,rods,oil pan and baffle,timing cover,balancer,flywheel,alternator,and starter.) One big drawback to the engine was that the block had to be machined down in the lifter bore to clear the exhaust pushrods. Another drawback was that in order to install the Hemi kit items, the engine had to be removed from the car. You then installed the Hemi items and reinstalled the engine in the car... The Penske-Donohue race team had won the 1968 Trans Am season and were looking for still another "Unfair Advantage". Chevrolet designed an experimental hemisperical 302 c.i. engine with the intention of selling it as an over-the-counter item in kit form. There were actually a small number produced. These engines proved to be costly to build, but they made horsepower. The engine used different pistons, camshaft,rocker arms,intake manifold,aluminum heads,pushrods,and gaskets. The magnesium valve covers featured a 7-bolt pattern.The camshaft is unique due to the reverse-lobe design. The one-of-a-kind Hemi head has the intake valve first and exhaust second.

[Born30YrsLate]

just found this interesting...arao engineering produces 4-valve heads for chevy engines 4-valve per cylinder chevy heads

[JacksonM]

Kind of funny how they say 6.86 ET on a 69 Camaro, lol, when the one in the pic is a 67 or 68 Camaro (67 front clip with 68 doors???). [img]/ubbthreads/images/icons/crazy.gif[/img]

[68TopStock]

These heads give me an idea. What would a 370 stroker with a crossram and 4 valves per produce? [img]/ubbthreads/images/icons/cool.gif[/img]

Wonder if Smokey ever built one like that?