Lee,

This is a crossram for a prototype Chevy 302, not Mopar Hemi.


Jason

Jim is trying to build a hemi 302 motor from the ‘off-road’ head package that I owned. Jim bought my complete Nos Hemi 302 setup from me ( less the intake base). I searched for over thirty years putting together the package. It had magnesium valve covers, but intake was aluminum. Years after purchasing the heads, I found the intake top and I even found NOS pistons for the setup, but never found in intake base ��.

There were apparently three hemi 302 complete motors built and some spare heads, etc.

I have seen another NOS hemi intake top plate besides mine, so I always thought it possible that an intake base exists.

If there is one out there, it will probably show up now.

The valve layout is different so what about a cam ?

The last time I was in Al Maynard's basement, I seem to recall an entire hemi-head motor on a stand down there. That was probably 2 or 3 years before he passed. Also, based on story of Al having the scrap contract for Chevrolet Engineering at the Warren Tech Center at one time, who knows how many parts for this setup were found. Does anyone know if these parts only surfaced through Smokey and/or Al or was there another known source?

Have to wonder why.

The only person known to have worked on the project outside of Chevrolet was Smokey Yunick. In three different articles over the years, he stated the Hemi 302 topped out at around 450 hp. The intake port design compromised exhaust flow.

The small-block hemi head was never released for production or used in competition. It's likely all the parts in existence came from Smokey Yunick's auction.

Over the years I have seen a few Z/28 built with the Hemi 302, one in The Shed collection. Not like he would be the first.

Well, being the first to do it is certainly cool. Being the last is also pretty awesome. Maybe he is planning to reproduce the system and needs the base for a mold?

Jason

That would be an expensive undertaking. The valves had longer stems, cam is completely different, need gaskets, etc.

It was a failed engineering project. Nothing more.

https://www.yenko.net/forum/showthread.php?t=115751

Funny this car says it was bought new from Roy Price Chevrolet in Bountiful, Utah. I know for a fact that Roy hated High Performance Chevrolets.

If Winters made the original castings for the manifolds, that would be the first place to start. They would probably still have the drawings, and the ability to produce the manifold. It might be cost prohibitive though.

Betcha it’s less than $125,000. Ha