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Old 01-15-2010, 02:15 AM
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Contradictory Chev Engine coding, 305 or 307?

Hi, I have a 305/307 engine that has two apparently very different numbers, the cast is 14010203 making it a 1980-84 305cid and the engine ID is K0620TCK making it a 1973 307cid, how can this be? Any help here identifying what cid and year engine I have would be great and if it helps the heads are cast 14022801 but I don't know if these were original on the block. Thanks.

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Old 01-15-2010, 05:19 AM
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Quote:
Originally Posted by kahl_454
Hi, I have a 305/307 engine that has two apparently very different numbers, the cast is 14010203 making it a 1980-84 305cid and the engine ID is K0620TCK making it a 1973 307cid, how can this be? Any help here identifying what cid and year engine I have would be great and if it helps the heads are cast 14022801 but I don't know if these were original on the block. Thanks.
Mortec shows 14010203...305...80-85...2 bolt
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Old 01-15-2010, 06:13 AM
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I would be more inclined to go with the suffix code above the right head.....which in your case shows...

TCK 1973 307 C-20 to 3500

Also, the 1st K in the code shows it is a Canadian engine, which one that ended up in New Zealand would have come from....likely
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Old 01-15-2010, 06:21 AM
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heads
14022801...80-86...305
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Old 01-15-2010, 03:14 PM
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Thanks, I guess the only way to verify is pull the head and measure the bore! Cheers
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Old 01-15-2010, 03:58 PM
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Casting # on back flange of the block trumps any stamped code on the front pad. The stamped application codes on the front pad below the passenger side head were often "recycled" and reused a few years apart on differnet size or hp engines, and should not be trusted until you have looked at the casting # and block cast date code.

I'm willing to bet $100 you have a 305.
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Old 01-15-2010, 07:47 PM
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I tend to agree ericnova72, especially considering the heads indicate early 80s as does the casting on engine. Cheers
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