I have a 5.0 HO out of a 1989 mustang. What is the
biggest cam I can get with stock heads..? I am
taking the FI off and running a 600 or 650 Holley
Check with a cam company or you can learn online. Really, all a camshaft change does is shift the power band somewhat. If you read Dyno sheets you WILL see engines basically make there power in 2000RPM band ranges. An example would be 0-2000RPM or 2000-4000RPM ..4000-6000RPM and so on 6000-8000RPM and 8000-10000RPM you get the idea. The idea is to optimize (Tune) the RPM band the engine operates in(You decide) of course a 5.0 spinning @ 6000-8000RPM could generate more power..than one spinning @ 2000-4000RPM. But would HAND GRENADE!