If your engine does not have shimms on the crank mains you should look at and consider this mod. I just did and it went in just fine and I hope it works as advertised.

http://www.enginebuildermag.com/Article/1766/old_iron_sealing_stovebolt_chevy_engines.aspx

1941 Chevy
"First rebuild - complete!"
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1941 GMC resting peacefully
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