[Ant]

Thanks David for your post, I am not sure what the make up of the Nascar engines are, the reason I am interested in the rotating mass may be more precision and stronger, also possible by some modification I could be better off with less hassle and have a strong block.

Craig Thats interesting about the supercars, very reliable nowadays but could as hours of usage go up become a time bomb!

I assume that Nascar engines are high compression, will look on the net and source information. My first Cobra was a bored FE 390 with Super Cobrajet heads that were off a drag car, hence me doing mainly road work the cam ran out of power @6500 before the heads really worked, so I don't want to end up with something that runs about 2000rpm higher than I need, but having said that I dont expect to get what I want without a bit of modification and some dollars.