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Need to have someone w/a Tech I look at duty cycle at WOT, or get it on a dyno and look at A/F.
Rule of thumb is to not exceed 80% DC @ WOT, though many "get away" with a much higher DC. As already mentiond, the addition of 45 more ci's would lend to the theory that you're choking the motor for fuel. If it were me, I'd nut up for bigger injectors and a wide band tune.
I wouldn't be banging on it much until you know how lean you are.
Just a thought.... how's your fuel pressure and have you done a fuel filter lately?
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'00WS6/A3
Bone Stock 346 
P292 B/FI
VENGEANCE RACING L92 416" Stroker
550rwhp/502rwtq NA
Track #'s coming-
F.A.S.T. 90mm | NW 90mm | TEA/TFS | TNT | ROSSLER | YANK | MOSER | QA1/HAL | BMR | WOLFE
"I spend my money on race parts and fuel...the rest I waste"
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