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Old 01-21-2006, 07:56 PM
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casting numbers help please

3978044 on the back 1gj219916 on the front sbc please help

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Old 01-21-2006, 09:35 PM
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Those numbers show up on any list I can find. Are you sure you have them right?
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Old 01-21-2006, 10:21 PM
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dont know if this will help but here goes...3970020 68 to 73=307...3970041 or 3970010, 68 to 69=327...3970014 68 to 76=350... 3970010 68 to 79 350 four bolt mains however, I have a tw0 bolt main with the same numbers labeled in my book as truck and high performance blocks. and that is all the 397 blocks I am aware of.
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