Aluminum versus iron when buying used LS

[Joyridin]

Are you looking for 600 crank HP, or RWHP? 600 crank HP is pretty easy to obtain with an LS3. You can almost do that with headers, cam, rocker arms, and springs. 600 rwhp is something I doubt you will hit without major work.

My LS3 with a BTR stage 4 N/A cam, headers, lifters, springs, and pushrods put 479 rwhp. We estimated a 15% loss due to IRS and a few other things.