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

xRugby8 · 10-05-2004, 05:38 PM

69 Chevy C20 w 350 Manual HEI Dist, 4 Brrl carb

Seems to be running a bit off. I checked the timing and it is showing 4 degrees ATDC. The engine is stock with the exception of the carb and distributor.

What should my timing be at idle?

What about the timing advance with higher RPMs?

I saw between 6-12 BTDC on different threads (for automatics). My truck manual defers to the sticker (that no longer exists) on the truck.

Thanks

JimKshortstep4x4 · 10-05-2004, 08:20 PM

I would set it at 10-12 degrees BTDC at an idle with the vacuum advance disconnected. If you have a spark knock at this setting retard the timing a couple of degrees.

Jim

xRugby8 · 10-06-2004, 12:36 PM

Thanks for the advice Jim.

10-05-2004, 05:38 PM	#1
xRugby8 Registered User Join Date: Oct 2002 Location: Sacramento, CA Posts: 24	Timing Question 69 Chevy C20 w 350 Manual HEI Dist, 4 Brrl carb Seems to be running a bit off. I checked the timing and it is showing 4 degrees ATDC. The engine is stock with the exception of the carb and distributor. What should my timing be at idle? What about the timing advance with higher RPMs? I saw between 6-12 BTDC on different threads (for automatics). My truck manual defers to the sticker (that no longer exists) on the truck. Thanks

10-05-2004, 08:20 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I would set it at 10-12 degrees BTDC at an idle with the vacuum advance disconnected. If you have a spark knock at this setting retard the timing a couple of degrees. Jim

10-06-2004, 12:36 PM	#3
xRugby8 Registered User Join Date: Oct 2002 Location: Sacramento, CA Posts: 24	Thanks for the advice Jim.



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