[Richard in Anaheim CA]

Referring to Brent's detonation diagnosis.

I broke off the top of #4 piston for no apparent reason. I had encountered severe detonation only occasionally and immediately cut back on the throttle and the advance. This was over a period of years.


When I was timing the engine with a timing light and for no reason clipped the light on #4 since it should be the same as #1. The distributor cam #4 lobe was 10* more advanced than the other 3 cylinders.

I didn't know I cound throw anything that far.

Richard
Anaheim CA