Performance question

[grey899]

Hi All,

Recently made the switch from a Demon 625cfi to a Holley Avenger.



Demon carb was a major disapointment becase is spewed too much fuel and fumigated me (re-jetting made no difference) .

Anyway, the switch to the Holley resolved that peticular problem, but now the car falls flat on it's face during acceleration (this is even after an expensive dyno tune).

Basic engine specs-
350 sb w/ mild to moderate cam
ported vortec heads
serpentine belt system
Heddman Headers
custom 3" exhaust w/ flowmasters (american Thunder)

Any advise would be apprciated.

Dave