Technical SBC timing issues

I took this from the October 2020 HRM. Hope it helps.

 

Try it at 6 degrees and see how it runs, SBC’s can run up to 10 degrees advanced with no issues, see what happens


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Can set the initial timing "by ear", can set it with a vacuum gauge, can set it with a timing light, can set it with a divining rod or whatever, any method will work but regardless ya gotta know what you're doing. No method will work if there are defects in the system, and the initial setting isn't the whole story and isn't that critical.

 

Here's an update on where I'm at with the timing problem.
1. Using the piston stop method I verified the TDC mark on the dampener was right on.
2. I discovered a vacuum leak in the lifter galley side of the intake manifold so I regasketed the intake manifold.
3. The mechanical advance curve (the distributor has no vacuum advance) was set for total advance at 5,500 RPM. I'm recurving the distributor so that total advance occurs at 3,000 RPM. I'm shooting for 30- 32 deg. total advance.

 

*Generally* moist SBC distributors have between 20° - 24° mechanical advance built in , full advance between 2-3000 rpm. Preferred total advance between 32° & 38° , the difference is between the two is the initial advance -
* Generally * 12° - 16°

 

You know if the cam is advanced it can make em crank funny sometimes.