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this was done during the initial casting of the block and heads. it tells you what car it was on and size of motors and the size of cc the head is. some block casting and not very correct. i have a bbc 396 that has acasting of " hi perf pass truck" there is no such thing. just " hi perf pass", or" truck". head casting a alot more accurate tho.
hope this helps.
What else can I help you with?
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