Will putting a hp525 cam in a carb'd 500hp make a big difference?
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I wouldn't expect huge gains going from a HP500 Roller cam to a 525EFI cam. It should pick up a little bit, maybe 100-200RPM at wot throttle. You'd probably wanna be spinning the engine a little faster than the 5200RPM redline on the HP500. Engines would probably make around 500-525HP on a dyno with the 525cam.. Switching to a decent set of aftermarket heads, 600HP is realistic, the stock GM heads are the limiting factor.