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Being a few degrees advanced or retarded will only move the power curve up or down a few 100 RPM usually. You would have to be a tooth off to have that amount of difference and with that size of cam it would hit.
An overlay of before and after would show so much more. Maybe the next time your at the dyno have the operator print one out. With that amount of HP gain it would reveal a ton.
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads
Totalled:
2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X
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