New heads/intake/rear end

340srule said

So your sticking with the 30+ year old iron heads..oh well,hopefully you'll step-up to aluminum some day and never want to use iron again...

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Sounds like it. But after Bobby gets done with them they will probably out flow any aluminum head. Just because they are aluminum dose not mean they can't be out flowed by iron. But one they thing is however is they will always be lighter.