Quadrajet or Holly 650

[cottonme173]

This is on a '77 GMC C2500. Stock 4 speed, 4.11 Gear. I am not racing, just running on the street.

SO, initially I am having issues at full throttle. When running I can get trough second and third, but when I go into fourth and hit the gas my truck stutters and fails to speed up. If I gently push the gas it seems to keep up. Not that I floor it a lot, but I should be able to punch it.

I know very little about the Qjet's so I am starting very low there.

I am going to pull the truck in for the winter and go through both gas tanks, replace lines, replace the mechanical fuel pump, so this MAY actually solve my issue. I have the option of getting and rebuilding a Holly 650 to put on the stock intake. Will this even be worth it? Will there be a performance (MPG?) increase doing this?

I hope there are not a hundred other threads on this ( I tried searching and didn't find any).

I would love your input on this!