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Old 10-25-2009, 05:36 PM
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Chevy SBC, finding TDC without timing marks

Hey Guys,

Thanks for all of your help & input thus far, I've got my SBC back together & driving.

I did notice something strange though, this morning I set the max timing to 34 degrees with the vacuum advance unhooked. The idle landed at 21 degrees advance. Yet the engine cranks & fires up just fine, theoretically wouldn't 21 degrees of advance at idle seriously fight the starter motor while cranking?

Perhaps what I'm seeing as 21 degrees of advance when the timing mark's align isn't nearly that high in reality, like the marks are off.

Is there a way I can find TDC of #1 without relying on the timing marks of the balancer & timing cover?

This SBC has Vortec heads, I do have a dial indicator. I have no problem pulling the valve cover to see the Int valve close. Am I on the right path here? Would a dial indicator even get down the long reach spark plug hole and touch the top of the piston with vortec heads?

Am I just making extra work for myself, and a Chevy SBC will crank with ease using 21 degrees of advance?

Thanks in advance
Cheers ~Mykk

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Old 10-25-2009, 05:46 PM
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All I ever did was pull a valve cover, be assured both valves are closed, remove the number 1 spark plug and use a breaker bar on the balancer bolt. I would slip a screw driver into the spark plug hole and move the breaker bar, when I felt the screw driver stop moving up I knew I found TDC.
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Old 10-25-2009, 06:11 PM
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