Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Sounds of detonation when exhaust is too loud
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Old 08-09-2010, 10:10 AM
Argess Argess is offline
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Cast iron 390/428 heads with hardened valve seats and bronze guide inserts. 72cc cardioid chambers, but likely with 10 thou removed during resurfacing.

Back during testing, I could tell the engine was fighting me at 28 intial, but not at 24, so I sort of thought 20 was safe. I'm actually searching for the lowest initial timing that still gives me a good idle and low rpm operation.

Never had any problems cranking engine. With idle set at 20 degrees, the dist springs are already working a bit. Cranking is more likely about 15 degrees.

It did seem to me that the crackle went away about 1/2 way through rpm range. Sort of ends when the advance stops advancing. Could have been my imagination, so that's another thing to check next test drive.
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