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Old 03-09-2004, 03:00 PM   #1
Daves72'GMC
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Question 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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Old 03-09-2004, 03:02 PM   #2
boraxman
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Pretty sure they all say that. I had a 402 and it did.
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Old 03-09-2004, 04:14 PM   #3
71402BB
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Yep, I agree. Mine says it also....... I don't think it is or means anything special.
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67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!)



71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well...

72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!)

68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!)

67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)
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Old 03-09-2004, 04:27 PM   #4
Tx Firefighter
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It means it is a normal block and not a tall deck big truck block (like a 366 or 427 truck engine)
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