Heres a source and info on used sb2 nascar engines The key to making BOTH power and having some hope of durability is in keeping piston speeds under 4500 feet per minute and maintaining valve train control while allowing the heads to flow at least about 280-300cfm, the newer heads like the 18 degree or better yet SB2 are what you need. you don,t need to spin an engine any more that lets say 6500rpm to make very impressive power PROVIDED the components used and the displacement are carefully selected and matched and if your 100% set on spinning the engine that fast, you might be much better off buying a used NASCAR race engine, before investing a ton of cash in this project. The first thing ID suggest is stepping, back and asking yourself why you want the sbc engine to spin 8000rpm, simply because controlling a valve train at those rpms is going to require a great deal of rather expensive parts, and its going to significantly reduce your potential durability. "GRUMPY,I want to spin a sbc to 8000rpm, and make good hp in a really light weight car for drag racing, what will I need"
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