71coupe
Well-known member
engine specs: engine rebuilt
306
comp cam (thumpr cam)
hypereutectic pistons
orig block
orig heads
long tube ceramic coated headers
flowmasters
pertronix dizzy
rearend - stock 3.0
the carb that the engine builder recommended was the street avenger - 570 vacuum secondaries, dual feed
The car has a slight hesitation when I stomp on it....just a half second maybe a second...then it blasts off. It runs pretty darn good; great top end. Of course with the 3.0 - doesn't help much. I plan on changing to 3.55. Had a ol timer adjust the carb the best he could, but still the hesitation exists.
Then I changed over to my "old" 4777-2; dual feed; true double pumper - carb was rebuilt so I just had to tune the rich/lean and float levels. took it for a spin and WOW...night and day! no hesitation....just spun the wheels like crazy! thought I'd never take off.
my question is: has anyone had issues with the street avenger - with vacuum secondaries.
how can an old carb perform much better than a newer one?
now don't get me wrong..the street avenger is nice if I'm cruising....great on gas as opposed to the double pumper...gas mileage went out the window!!! hahaha I'm loving the old carb..."I stomp and go and I control the secondaries"....car is just a weekend hotrod....
hahaha...here is pic...showing...good 'ol american muscle....stang!!!
306
comp cam (thumpr cam)
hypereutectic pistons
orig block
orig heads
long tube ceramic coated headers
flowmasters
pertronix dizzy
rearend - stock 3.0
the carb that the engine builder recommended was the street avenger - 570 vacuum secondaries, dual feed
The car has a slight hesitation when I stomp on it....just a half second maybe a second...then it blasts off. It runs pretty darn good; great top end. Of course with the 3.0 - doesn't help much. I plan on changing to 3.55. Had a ol timer adjust the carb the best he could, but still the hesitation exists.
Then I changed over to my "old" 4777-2; dual feed; true double pumper - carb was rebuilt so I just had to tune the rich/lean and float levels. took it for a spin and WOW...night and day! no hesitation....just spun the wheels like crazy! thought I'd never take off.
my question is: has anyone had issues with the street avenger - with vacuum secondaries.
how can an old carb perform much better than a newer one?
now don't get me wrong..the street avenger is nice if I'm cruising....great on gas as opposed to the double pumper...gas mileage went out the window!!! hahaha I'm loving the old carb..."I stomp and go and I control the secondaries"....car is just a weekend hotrod....
hahaha...here is pic...showing...good 'ol american muscle....stang!!!