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When I removed the P/S,A/C and opened up the intake my engine idled easier but now has a tiny bit of a lope.....like the cam was swapped. Sounds nice. GOES LIKE A BAT OUT OF HADES! Gets good mpg too.
You do need some flywheel weight but not too much. I would give the 7 lb flywheel a try. You can always put the old one back in.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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