[hdheritage97]

I wouldn't say that I'm an expert here on this topic but I do have an opinion. The NASCAR engine had heavier rods and to allow for them, wider rod journals. I know the NASCAR rods won't fit on a LeMans crank. Other than that, I don't think there is any difference in the blocks, or the bottom end, such as main caps. I'm not sure which heads they used, although I could certainly look it up in the piles of books I have here on these engines....lol. I have heard that the Tunnel Ports were used there, as well as the Drag Strip, but if you want, I can look into it and make another post ? Hopefully, this clears up some of your questions and if someone else thinks otherwise, I'm all ears.

Cliff