Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Pontiac 406 popping above 4000 RPMs
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Old 04-16-2002, 05:21 PM
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How are you measuring the rpm? Had the same problem with a 69 stang. Seems after the third performance engine buildup the car did the same thing (it was a little more radical than the first two), only after I measured the rpm with a nonfactory tach did I see that the factory piece of s_it was reading 4500 and the engine was actually doing 7000 according to the SW race tach I installed later. That kind of explained the other two engines I blew out of that car (rods through the block), I was thinking the factory short blocks were just crap. Honestly I couldn't hear any difference inside the car. Not too proud of that one.

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