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Old 09-01-2019, 08:02 AM
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engine # decode

I Have a 68 RS SS Camaro 350 Power Glide Automatic With a engine code MJ2380 is anyone able to decode?

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Old 09-01-2019, 09:00 AM
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You trying to figure out what the block is?
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Old 09-01-2019, 09:18 AM
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Yes I now it doesnt have the right heads wondering if the motor was changed as well
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Old 09-01-2019, 10:32 AM
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Quote:
Originally Posted by KHanson View Post
I Have a 68 RS SS Camaro 350 Power Glide Automatic With a engine code MJ2380 is anyone able to decode?
If that is a big block it would be a period correct prefex of a 427 for a Corvette in front of an automatic, go figure? If a small block, it' most likely a Mexico built crate motor. Pull a rocker cover to get the head casting if you can't see the block casting number. The casting numbers can be a lot of help in tracking down what the motor is.

The GMPP crates use a different code from production, that leaves off the suffix. The standard Chevy production code has a prefex of 2 letters that tell where cast and assembled, a date code of numbers, then a suffix code telling application of two to three letters. Production engines on this same pad as the build code also are stamped with part of the chassis VIN number which is what is meant by the term "numbers matching" of engine and chassis.

The casting numbers will provide a rough path to determining what size and configuration of the engine; for the block's as 305 use one set of numbers, 4 inch bore like 302, 327, 350 a different set, and 400 another unique set of casting numbers. Heads can be a little trickier as there is some slop over between 305 and 350 heads and between 350 and 400 heads.

Bogie
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Old 09-01-2019, 10:32 AM
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This site may be of help.

https://www.mortec.com/location.htm

https://www.mortec.com/castnum.htm
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Old 09-01-2019, 11:28 AM
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after looking closer at the photos and some research I feel it was a bad stamping and the J is most likely a U with makes sense being a 68 295 hp 350 thanks for all your help
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