What is compression, fuel used and timing? I could suggest checking timing, then upping the octane with premium or race gas, and see if car runs cooler. Silent detonation will build heat in our engines.
I once had a 350 in my LeMans i overadvanced the timing on. Even tho the engine only had 9:1 comp and I used 93 octane, it still detonated silently. It ran very hot at high speed, until I backed total timing from 38 to 34*. Dissassembly of the engine revealed connecting rod bearing damage, which is a telltale sign of detonation.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
Last edited by chiphead; 06-17-2006 at 10:14 PM.
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