An old mechanic put me on to using a vacuum gage.
I use to toy with GM big block powered jet boats. I just purchased an big easy to read simple vacuum gage at a parts house and hooked it to a port on the intake.
His suggestion was to advance the distributor until the gage maxed out and began to flutter, and then back the timing off to a stable reading.
It always seemed to work.
Regards,
JD
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Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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