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Hi Perf. code on engine block?

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03-09-2004, 03:00 PM	#1
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	Hi Perf. code on engine block? I have a '72 GMC and on the origional 402BB in my truck it says Hi Perf. on the engine block. What does this mean? Thanks . Dave

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