[yarddog]

No I was talking about the ones used in 1964 and that era.

Why was the single overhead cam version banned by Nascar? Was it not available on production cars?

[mabarker1]

Most likely because the Rule Book states Push Rod V8

[mountn man]

This is the Ford GT40. The GT40 won Le Mans in '66-68 or '69.

The engine made it into just enough production cars.
Chrysler pushed Nascar to ban it. I'm not sure on what grounds though. About the only one I heard was that it would push speeds to high. I've looked around to see if anyone has put a SOHC in a GT40. I've read of maybe a couple of people talking about it, but haven't seen anything definitive.

Its a BIG engine, in a not very big engine compartment.

It would be a beast of a car.