hey, i was wondering the same thing. is the engine doing this or is it the tach. i have a P.O.S. tach and it does the same thing.
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1966 ford mustang coupe.
302H.O.+H.O 450hp
350 hp dual stage NOS
4:11 8" aburn Prorearend
ATI c4 reverse manual valve body.
no e.t. yet
before rear swap and NOS addition ran 15.1 with the 2.78 rear gears
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