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SC Detonation Problem
When getting on the gas in my SC there is normally no problem with detonation, even if running regular pump gas (87 octane) as opposed to 91 octane premium. But, if I get on the gas hard in 2nd gear, there is a very brief transient rattle as I pass thru 5200 RPM. It only lasts a split second, but it is definitely there, and loud - and leaves a noticeable cloud from the exhaust. Obviously I try to avoid this, but it is a repeatable, consistent occurence under these specific conditions.
Any suggestions on how to track down the problem? Timing is set per factory and there are no other driveability issues that (at least to me) would suggest a distributor problem, etc.
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1978 SC Targa (mine since 1985) - ah, youth . .
2008 E63
2004 Van's RV-6 (O-360-A1A & Hartzell C/S) - just for fun
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