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As an alternative, you could throw it on a dyno to see if power really changes at those RPM's. Could be pulling timing on some false knock, It would be obvious on a dyno. On top of it, you'll get a nice baseline dyno sheet.
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1969 Pro-Touring MaCh 1 - CHP 427w 10.8 comp - 3140 lbs. - 460 rwhp / 490 rwtq
T56 Magnum || 14" 6 piston front / 13" 4 piston rear Wilwood brakes || Hydraulic clutch || 9" Detroit Locker || TCP Coilovers || Forgeline Wheels 18x10 275/35 front, 19x12 325/30 rear |