Some info I found...
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PT's Slowest Truck
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Joined: Apr 2004
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From: Hackensack, NJ
...while researching casting numbers. Didn't find what I was looking for, but there's some good reading here from HotRod and Car Craft, enjoy 
http://www.hotrod.com/howto/113_0504...ics/index.html
http://www.carcraft.com/techarticles...ads/index.html

http://www.hotrod.com/howto/113_0504...ics/index.html
http://www.carcraft.com/techarticles...ads/index.html
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