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Old 04-10-2013, 04:08 PM
jwc jwc is offline
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chevy block cast numbers

I have a sb chevy block full circle rear main that has no stamped id numbers or letters. on the drivers side of the block between the freeze plugs 099 is cast into the block and on the bellhousing flange there are these letters and numbers co 5.7lt gm sg1 can anyone tell me what I have? jwc
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