Within Stock rules???

[Dwight Southerland]

Originally Posted by Robert Simpson

If I remember correctly the heads were CNC from the factory? If that is the case how can NHRA prove that additional CNC had been done? Short of the cc's? When I first saw several years ago where CNC heads were installed on some of the super cars that clearly opened the door for additional porting. The thing I don't get from the article is the changing of the cam, to a larger grind? How can you tell this "Stocker" engine from a "SS" engine??

On the subject of the porting, you are correct. This was an issue on the SS AMX heads throughout their history. How do you know what is correct?


As for the camshaft specs, the .641" lift is what is in the Tech Bulletin, regardless of any advertising for the LS7. I suspect that some of the confusion is that people assume this engine is the same as the LS7 engine installed in Corvettes, but it is not. It is a spec engine for their Factory Shootout cars, not a production engine.