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Old 09-23-2012, 09:15 AM
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GM Crate Engine ID

Got a question that I can't find an answer to. Bought a truck w/ a 383 GM crate motor. Came w/ cast heads. The #'s on the front pad are as follows: 1MO 412 then directly below it is OVP. Anybody have any ideas? .This engine was purchased about 3 yrs ago. Any 411 would be greatly appreciated.

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Old 09-23-2012, 10:24 AM
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GMPP (GM Performance Parts) offers 2 versions of 383 CI crate engines. The ZZ383 425HP version comes with fast burn aluminum heads. The HT 383 (HT stands for High Torque) comes with cast iron Vortec heads, so it sounds like this version is what your truck has. The engine is rated 340 HP 435 torque. Here's the page from GMPP with all the specs: HT 383 specs

If your engine is the HT 383 the heads should look like those in this picture from GMPP:

This is what the heads look like on the ZZ 383:

Here's the GMPP dyno chart for the HT 383:

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