I have been doing a little maintenance getting ready for spring and went for a short run this morning to make sure all was good and to blow off the dust. Opened her up after she got warm and when I would try to accelerate hard in 2nd and 3rd it would begin to sputter at around 4500 rpm but in 1st I could run her up 6-6500 with no problem. I could limp her through it and It would smooth out most of the way and accelerate. Time is good at 16-17 deg, fresh 110 octane cam-2, clean air and fuel filters. Holley seems to be in tune, floats are good, roughly 16" of vac on the air/ fuel. Any ideas? Thanks!

 

Fuel Pump?

 

Are you running a elic fuel pump?You mite check the resetore on the dist cap if you are runing points. Also check all your ground wires. if you are runing just one try running two or more. run one from the firewall to the intake.My 66 dodge with a 470 bb was doing the same thing.I put a elic fuel pump on it and two more grounds and it stoped.

 

last year i decided to use GM's 2 good ideas and switched to a one wire alt and a HEI dist, so no points anymore. I am however using a holley high p/v mech fuel pump but I have a new electric one on the shelf waiting to be installed.

 

If you have a rubber hose between the fuel tank and fuel line and it is old they have been known to suck air and not leak. Cheap check.

 

everything is pretty much new with just over 5k miles on the build but anything can go bad. I'll be installing the electric pump in the next day or two. thanks for the sugestions guys

 

Make sure you put the electric pump as close to and lower than the fuel tank. They are great pushers and lousy suckers. No pun intended.

 

Already have a spot in mind, and lower than the tank won't be a problem since it is a keg in the bed.

 

you running 12v on that hei dizzy or still connected to the resistance wire ?

 

It runs to the ignition sylinoid.

 

I did have a cheap fuel filter on my 428, that at higher RPM's it would collapse and cut down on fuel.

 

mine is glass with mesh inside of it and I have the same one on my 78 f250 and it is fine so I dont think it is an issue on mine. thanks for the input

 

Finally got around to swapping out the mechanical pump for electric and now it rips around throughout the rpm range. Thanks all.