GM HEI centrifugal advance blocked ??
I'm into changing the weights and springs in a GM HEI on my '69, due to finding I can only get roughly 5* centrifugal advance.
the initial is already locked full advance, (prior owner~thing), so my balancer-best * for cool idle and easy starting has been 17.6* before, more or less.. (fluctuates due to the cam). at 3000 rpm, my total is 22*. that reading is relatively steady, but the engine has always had a slight "miss", thru all RPMs, kinda like an overlap-fire, if that is a good description....
my question is:
after removing the weight plate (to replace it with the new one from the Moroso kit), I see what looks-like "slugs" or "plugs", welded into the slot where the centrifugal mechanism moves to allow centrifugal advance.
in other words, I understand by looking why I can't get but the few additional degrees centrifugal, but why, or what,, would be anyone's reasoning, for fixing the centrifugal to only have "x" given degrees of centrifugal ?
I have an engine builder coming-by to take a look, so I'll be gone from here for a while,, but I'd appreciate any feedback if any of you have seen or done this, or understand why ....
'69 SS X66 Camaro
454, TH400 & GearVendor, 12 bolt
'81 Camaro Pro Bracket car.
406, TH350, 10 bolt, NHRA #3148