Timing curve chevy 5.0L marine OMC?

Question

I need to know the proper timing curve, I know the base timing is 8 deg and the maximum advance is 35 deg but Im not sure when it should start advancing, as boats are always under load, more so out of the hole.

Answer 1

Your  asking about dynamic timing.  I've watched this hundreds of times on OMC 5.0 and 5.7 engines.   I was using a Snap-on timing light that would change as the engine accelerated.  I was only concerned with the idle and max.  which you know.  Since I never had any distributors that didn't advance in this range, it wasn't a concern.  If I was having acceleration problems, it was always the carb. adjustment.  Can you even change the curve on one of these distributors?  The centrifugal advance? I know it picks up right away.

Answer 2

To find the timing curve you will need a marine manual for OMC.You will also need the year of your engine.Good luck.