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Distributer setting for a 4.3 V6 GM engine

Vortec or NO Vortec, that suggests nothing about the piston selection.
If full dished pistons, you'd best stay within the perimeters of the OEM advance specs.

Detonation is one of the gasoline Marine Engine's worst enemies.
 
Thanks for the quick response. I have a brother who is a engine machinist and the advance he does on race cars I though was a little too radical for a boat. I will just ignore what he said and set it at 24 as I was instructed to.
 
Your brother would be perfect for this because he will understand Detonation, the Quench Effect and Squish Waves (and the lack of), LPCP @ 12/14* ATDC and so on. However, he'll need to know the differences in Marine loads, C/Rs, and the potential for Marine load ignition induced detonation.
Not same as HP Auto!

Your number of 24° is rather meaningless without an associated RPM!
This is why you need to see your OEM specs.
They should give you the total advance and the RPM at which it is "full in" for this particular build.
The Vortex 4.3L is likely using the full dished pistons.
If so, I'd be rather conservative on the advance!


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