What ignition module to you have? What tach are you using? If it's stock tach, the 5000 you're seeing may actually be anywhere from 4800 to like 6400. I've seen stock tachs that are that far off. If your tach happens to be off and your ignition mod has a rev limiter, there you have it. I'd get an aftermarket tach to check and see how accurate the stock tach is and if it's still missing at 5000 check to see if the ign mod has a rev limiter. Sometimes you can change where they're set.
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Michael Black
Quantum Motorsports
Norman, Oklahoma
1988 Merc Cougar 5.0 HO, P&Ped heads, 2.25" custom mandrel bent dual pipes, T5 five speed tranny
15.43 @ 91.08mph (not shabby for a 3600 pound car)
60' 2.453 Street tires suck!!!
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