Early GMC 248 and 270 crankshafts have 4 bolts (not 6) that attach the flywheel. Has anyone attempted to re-drill the flange for the 6 bolt pattern? Yes, I'm aware that the ignition timing mark would have to be altered due to different clocking of the flywheel in relation to the crankshaft! I'm bidding on a couple of GMC cranks on Ebay, both with 4 bolt flanges.
Jerry

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