Timing Help? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

YourBuddy'sTruck · 04-30-2015, 06:34 PM

I've something odd that has me scratching my head while trying to set my timing. Maybe I'm lost?
350 with HEI. Recently replaced Module, Coil, Cap, and Rotor.

Engine off...timing set with rotor dead center on #1 Tab and Balancer Mark at 12*BTDC.
Fire it up...Light shows it at 4*ATDC...Vacuum disconected
So I set #1 at 8*BTDC with the Timing Light.
Shut it off and it shows just above 28*BTDC by manually lining up Rotor with Tab.
Timing Light shows #1 and #6 the same and no fluctuation.
Am I looking at things the wrong way? Am I missing something?
Anyone else have something like this? Any insight?

04-30-2015, 06:34 PM	#1
YourBuddy'sTruck Registered User Join Date: May 2013 Location: Catawba Island, OH Posts: 203	Timing Help? I've something odd that has me scratching my head while trying to set my timing. Maybe I'm lost? 350 with HEI. Recently replaced Module, Coil, Cap, and Rotor. Engine off...timing set with rotor dead center on #1 Tab and Balancer Mark at 12BTDC. Fire it up...Light shows it at 4ATDC...Vacuum disconected So I set #1 at 8BTDC with the Timing Light. Shut it off and it shows just above 28BTDC by manually lining up Rotor with Tab. Timing Light shows #1 and #6 the same and no fluctuation. Am I looking at things the wrong way? Am I missing something? Anyone else have something like this? Any insight?



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