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454 BBC casting "PERF PASS"

2K views 5 replies 5 participants last post by  79454 
#1 ·
"PERF PASS" is cast into the 454 block I just acquired. It came with a forged crank as well. Is this a Vette engine or what? I assume this means "performance passenger".
 
#2 ·
Not necessarily. The 454 I used in my pro-street car came out of a Suburban and had the same casting mark.

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#4 ·
if it came with a forged crank and 4 bolt main caps id say that it either came in a corvete or chevelle, what to look for is the casting numbers on the back, just above the tranny mounting bolts, it should read 281 and even better 512, which is the same block as the LS-6 with heavier walls, 4 bolt mains and so on
 
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