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Old 05-21-2006, 02:16 PM
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350 engine

i've purchased a 350 engine with casting # 3970010 and has a suffix code of TBF. i know this block has come out of a chevy truck, but have not been able to determine what other options this engine had. i've located this code in a few books i have, but the abbreviations they use are not familiar to me. i was wondering if someone could tell me what this suffix code means?? carburation?? transmission ?? etc?? also, is there any difference between a 350 "truck block" and a 350 passenger application?? it is a 4-bolt main engine and i'm hoping to build it up and install in a 57 chevy belair... thanks for you help... greg

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Old 05-21-2006, 02:49 PM
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Look on the back of the block on the upper left side or on the front of the block under the timing chain cover and see if it has either 010 and/or 020. If it has 010 that means it has either 1% or 10% (depends on who you ask) extra tin and 020 means it has either 2% or 20% (depends on who you ask) extra nickle making it a high nickle block. Regardless of whether it's the bigger or smaller percentage a 4-bolt 010/020 is the most desirable block in a 350.

FWIW, the 350 in Old Yeller is a 4-bolt 010/020 high nickel block.
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