OK guys I have a 30 over 454 11.5:1 aluminum 310 ported heads,solid roller .660 lift 245 intake and 253 exhaust duration cam.tunnel ram 660 carbs. Cam says 4500-6500 rpm. Jet boat levels out at 5700 rpm with b impeller. Cam is in at 109*advanced.i wanna retard it to see if I can get more rpm. whats a good number to try?
can timing
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