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Dr. Greenthumb
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Discussion Starter · #1 · (Edited)
I bought a 84 Camaro with a blown up engine. The engine I pulled out has forged pistons in it. They appear to be speed pro's, or TRW. They have a 12556 030 on top of them. I figured that was the part number. I've been trying to find the number but comeup with nothing. Does anyone know what they are ? Discontinued possibly, or maybe they merged with someone, and the number has changed since these were made ?
With the 030 at the end, I assume theyre 30 over. My ol' mans rebuilding it, and didnt know if he should use them or not.
 
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