Quote:
Originally Posted by 78w72
ok. thought i recalled in one of those threads awhile back that you said the engine had pretty bad knocking with the 2157 cam & that you had to retard the timing &/or add more than one bottle of octane booster to stop it. maybe it was in the "93 octane 10% ethanol" thread, just remember you saying you "just add more octane booster untill the pinging stops" or something to that extent.
sounds like the same issue going on here, as cliff & others have said, the cam is WAY too small for the engine combo & is whats causing the detonation.
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Actually, the pinging was just as bad or worse with the big cam.
So you can't blame the ping on my cam choice. I know you love to do that but it's not true. It's the compression, not the cam. The 703 install was enough to prove it.
The 400 came with the 72cc round ports when I bought it so it's high compression. Much like a 455 with the higher cc round ports like the guy here asking for help. No way in heck I would switch those heads for 6x heads like you advised. That would be a mistake in my opinion. You can keep circling around that point if you like. I would like to help the guy who started the thread if I may.