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Old 10-14-2002, 12:48 PM
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Post 010 SBC casting number question's

Right now i am building a small block cehvy for my firebird. The block is a 72 vette motor and under the timing chain cover it says 010 and under it, it says 020
like
010
020

I herd that kind of block has good nickle content and some other metal into it. The block is untouched never bored or honed and the cylinder walls are in good shape. I may half to take the engine apart in a few months cause one of the oil-contorl rings is bad and it is smoking. I put a stock cam in lower then stock intake in. SO im not sure if im benifiting bye the good casting ##'s Is this block worth alot, or should i just fix it for my normal use or should i sell it and fix up another block I have. The block is only has 2 bolt mains. Any advice would be nice. Thanks

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Old 10-14-2002, 07:53 PM
E.T. divided by $ spent= Speed
 
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I think so too.Try www.chevytalk.com they should know.
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Old 10-14-2002, 08:12 PM
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You have a good block there, 2 or 4 bolt. 10 and 20 represent the tin and nickel content of the block (according to my book). 10 is the percentage of "tin" (for more even heating/cooling expansion/contraction of the block), 20 is the percentage of "nickel" (providing harder bores and overall ridgidity). A 10 or a 20 only, will represent the "nickel" content. I have the same block (3970010 4 bolt),with the 10/20#s and after 40,000 miles (some very hard) you can still see the cross-hatch pattern in the bores real clearly.
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Old 10-21-2002, 03:19 PM
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True but is it more valuable??
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Old 10-21-2002, 07:27 PM
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It is more valuable than one that has only trace amounts of tin/nickel. I would rather have a two bolt with tin/nickel than a four bolt without.
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