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Nobody thinks the stock exhaust manifolds might be an issue?
I'm thinking since he states "It has poor performance off the line and until the RPM get up there." that the exhaust has no effect. Headers or Performance Exhaust has very little effect with low end "Grunt".
The cam has moved the Torque "LOW END Grunt" into a higher RPM Range.
A different Torque Converter that would allow the engine to "Slip into" the higher RPM Range should clear up his issues.
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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