Quote:
Originally Posted by Matt Meaney
While it is essential to have the distributor mechanical / vacuum advance itself known and spot on, don’t overlook the number one piston to timing mark on the balancer to timing mark on the engine relationship. it needs to be spot on as well. An accurate known base timing is the corner stone for a correct timing curve / total timing.
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Pontiac engines are better than others with just a sheet metal tab on a timing cover, (like a SBC). But it does need to be checked and verified as balancers can have a slip on the outer ring or just be wrong with aftermarket parts. My experience is Pontiacs are generally +-3 degrees of true Zero. But that is a 6 degree range. Could be the difference between perfect and melted pistons in a race Pontiac engine.