timing advance question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cableguy0 · 04-30-2010, 02:58 PM

Locking out the mechanical advance will kill your performance and mileage. locking out a distributor is typically only done on race engine which have another form of ignition advance electronically. The amount of timing provided by the mechanical advance depends on the distributor and the springs and weights used. Generally on a sbc you want 36-38 degrees total timing(initial plus mechanical. Then the vacuum advance will come in on top of that. usually sbc's like between 12-18 degrees of initial initial timing. Mechanical will provide the rest to get to the 36-38 range. Theres a good article at the top of the engine and drivetrain forum on how to properly set the mechanical advance and curve the distributor.

will scratch · 04-30-2010, 05:59 PM

thanks that really helps. I'll check out the other post also.

04-30-2010, 02:58 PM	#1
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: timing advance question Locking out the mechanical advance will kill your performance and mileage. locking out a distributor is typically only done on race engine which have another form of ignition advance electronically. The amount of timing provided by the mechanical advance depends on the distributor and the springs and weights used. Generally on a sbc you want 36-38 degrees total timing(initial plus mechanical. Then the vacuum advance will come in on top of that. usually sbc's like between 12-18 degrees of initial initial timing. Mechanical will provide the rest to get to the 36-38 range. Theres a good article at the top of the engine and drivetrain forum on how to properly set the mechanical advance and curve the distributor. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

04-30-2010, 05:59 PM	#2
will scratch Registered User Join Date: Mar 2010 Location: wichita kansas Posts: 22	Re: timing advance question thanks that really helps. I'll check out the other post also. __________________ 79 2wd Blazer/ flip kit, drop spindles, drop springs. 355 c.i. sbc, 350 tranny



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