Ya gotta be kidding...

[Bill Harris]

Originally Posted by SSDiv6

It appears you are not familiar with Stock/Super Stock engine rules and specs.
No, you cannot just go build an Ebay engine.
There is a specification sheet for cylinder head volumes, stroke and rod lengths.
Also specific part numbers for the cylinder heads, intake crankshaft and connecting rods..

Yeah, that is a problem for the D3 heads in that FoMoCo only sold the heads in an unfinished form and left it to the engine builder to complete the ports and combustion chamber. The NASCAR guys built a huge variety of heads designed for particular tracks. Short track heads were completely different than fast unrestricted track heads and restrictor plate heads were different than all the others. So going to Yates or whoever and buying a set of D3 heads won't get you to where you need to be for a drag race engine. It would be really expensive to develop an optimal D3 head for drag racing since it is really new territory. A NASCAR head developed for a track like Martinsville would probably be a good starting point.