Pontiac Engine >> CRANKSHAFT UNDERSIZE FROM FACTORY
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Pontiac Engine >> CRANKSHAFT UNDERSIZE FROM FACTORY
Factory Undersize Crankshaft
Identification Marks On
GM (Pontiac) 5.0 & 5.7L (305 & 350 CID) Engines
GM (Pontiac Motor Division) announced that it has changed its method identifying crankshafts with undersize main journals from their factories for 5.0 & 5.7L (305 & 350 CID) engines.
Previously when crankshafts were used with undersize main journals, all journals were .009 undersize and 009 was stamped on the oil pan rail and the back side of the main bearings.
Now crankshafts with only one or more (but not all) undersize main bearings will have a 9 stamped on one side of the undersize journal and a large spot of light green paint. The main bearing cap will also be painted light green on each side.
Main bearing inserts will still be identified with 009 US on the back surface.
Note: TB 172, April, 1978, provides similar information from Chevrolet Motor Division.
The AERA Technical Committee
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