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mike22l · 05-30-2009, 05:58 PM

I have a 3/8 dirt track race car with a 350 chev using a stock GM HEI distributor. I'm trying to set the timing and the timing mark keeps moving.
I'm trying to set total timing at 35 deg and when I rev the car up to 3000 rpm my 35 degree mark keeps moving plus and minus 5 degrees. very erratic. it has the vacuum advance disconnected but does use centrifical advance.
I am using no 1 cyl and using a 400$ snap on timing light. Could it be that the bushings are worn in the distributor? bad coil? bad module?plug wire that i'm connected to? Would a worn upper bushing cause this problem? All your thoughts please.

05-30-2009, 05:58 PM	#1 (permalink)
mike22l Registered User Join Date: May 2009 Posts: 5 OS: vista	timing mark keeps moving on race car I have a 3/8 dirt track race car with a 350 chev using a stock GM HEI distributor. I'm trying to set the timing and the timing mark keeps moving. I'm trying to set total timing at 35 deg and when I rev the car up to 3000 rpm my 35 degree mark keeps moving plus and minus 5 degrees. very erratic. it has the vacuum advance disconnected but does use centrifical advance. I am using no 1 cyl and using a 400$ snap on timing light. Could it be that the bushings are worn in the distributor? bad coil? bad module?plug wire that i'm connected to? Would a worn upper bushing cause this problem? All your thoughts please.