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The Buick straight 8 only had 5 mains, and I believe this 6 did also. Modern I6 engines like the indestructo Jeep 4.0 and the 225 Mopar, they have 7 mains.
 
Remember a flattie V8 only has 3

I just read in 1935/1936 Pontiac increased the main bearings to ..........4. Good news is this engine like the straight 8 Pontiac had full pressure oiling. To give you an idea, Chevy's of the same era did not.
 

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