Engine Code unrecognized

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Nov 10, 2009 | 07:48 PM

massa250

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1st Gear

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Engine Code unrecognized

I am trying to decode an engine code in a 1971 Corvette with the Suffix of C7F. I cannot find this in any of the books I have. Does anyone know what this code refers to. This is stamped on the Boss on the front passenger side of the engine. The complete number is C7F40888.

Nov 10, 2009 | 07:59 PM

Goody

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From: Oak Harbor WA

Tried a few sites to find this as well and it is a mystery so far. Are you sure of the stampings??

C7A 1985 305 Roch E4ME carb. H LG4 150 4 B F G/Omega
C7B 1985 305 Roch E4ME carb. H LG4 150 4 B F G
C7D 1986 305 Roch E4ME carb. H LG4 150 4 F
C7H 1986 305 Roch E4ME carb. H LG4 150 4 F
C7L 1987 305 Roch E4ME carb. H LG4 150 4 F/police/taxi
C7M 1987 305 Roch E4ME carb. H LG4 150 4 F/Kingswd

Nov 10, 2009 | 08:50 PM

Mike Ward

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That's not a code from 1971 or any similar year. Most likely a recent-ish GM crate engine. What's the casting number and date on the block?

Nov 11, 2009 | 12:04 AM

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

The first 3 should all be letters. Are you sure the second is a 7?

Nov 11, 2009 | 12:10 PM

Mike Ward

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Quote:

Originally Posted by 63mako

The first 3 should all be letters.

Not correct. Original engines have one letter followed by a series of numbers, followed by the two or three letter engine code.

GM Targetmaster engines have a stamping sequence very similar to the OP's, that's probably what it is.

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