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Old 12-26-2017, 09:16 PM   #6
Alex V.
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Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
Re: Questions about using a timing light

The factory timing numbers are way conservative - start at 8 and look to get more. Look up discussion of timing by ear/feel. To find the sweet spot you'll have to go past it, but as long as you're paying any attention and bump it back down a little before you drive hundreds of miles it won't hurt the engine at all.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.

1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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