awag,
they are indeed different. the gmc pattern is on a 4" bolt circle with 1/2" bolts & the bolt holes are not spaced evenly around the circle. i'm guessing this precludes the use of dowel pin alignment.
the chevy is on aproximately a 3&1/4" bolt circle with 7/16 bolts & dowel pins.
that's leaving me curious as to whether any other engines use the same bolt pattern. i know 455 pontiac used 1/2" flywheel bolts. anyone know anymore about this please chime in.
congrats on you're 302 i was sure tickled to get mine a few weeks ago.
robert
