[Formulajones]

I believe you are referring to a feature that you generally see on the later carbs from the mid to late 70's. You have to remove or drill a well plug in the air horn just in front of the float vent to access it.
It's an adjustment that moves the meter rods up and down to fine tune the AFR at light throttle conditions.

What you read was probably a lean stumble they were experiencing and they simply fattened up the fuel curve by backing out the APT screw to cover up the lean condition.

[Mezzo]

Originally Posted by Formulabruce

1. No dont steal weights from the unitized, get a recurve kit for an HEI and read the directions that come with them on vacuum and what spring, weight etc.
http://www.ebay.com/itm/Moroso-72300...1fb858&vxp=mtr
2. NJ Steve has an excellent point, the pump MUST have a spring in the skirt...in the carb.

Bruce, I called Moroso directly and they said the 72300 part number is for a Chevy only. Stumpted again.

[Formulabruce]

not true, weights can be flipped and springs are springs, they are just covering their ass. GM HEI is pretty standard, only difference being the direction of rotation.. ( CC for Pontiacs)

[Mezzo]

Originally Posted by Formulabruce

not true, weights can be flipped and springs are springs, they are just covering their ass. GM HEI is pretty standard, only difference being the direction of rotation.. ( CC for Pontiacs)

That's helpful Bruce. I can get them at O'Reilly near me. I'll post results. Thanks.

[Mezzo]

A huge thanks goes out to Tri Power Automotive in Libertyville, IL for solving the mystery hesitation problem. Jon and his team determined that the QuadraJet power piston spring tension was a bit soft and needed adjustment. I'll post the burnout when I get the car back.

[weranc55]

Originally Posted by Mezzo

A huge thanks goes out to Tri Power Automotive in Libertyville, IL for solving the mystery hesitation problem. Jon and his team determined that the QuadraJet power piston spring tension was a bit soft and needed adjustment. I'll post the burnout when I get the car back.

Good to hear. Jon and Mike are good guys and know what they are doing.