Clevite/Mahle has a listing for .040 undersize bearings for a Pontiac engine. That doesn't mean they are very available. However, a SBC STD rod bearing is 2.100 which is the same as a Pontiac bearing -.040. That doesn't mean it will automatically work. You or your machinist, will need to verify ALL the dimensions of a SBC bearing if you want to go that direction and make sure the bearing tang, width, chamfer and radial wall thickness is all the same and can be safely used. the .040' undersize crank journal is not an issue, the correct bearing is of course. I think the problem can be solved. Much less of an issue than a main bearing issue where bearings are very limited for a Pontiac engine.
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