carb jetting
#1
carb jetting
I just fitted a zz383 gm performance engine. The carb that I used is a holly double pumper 4150 series pn 0-82751 , 750 . What jets and power valve should I start with? I also used their single plane intake.
#3
Drifting
I have the same problem....383 with a Barry Grand 750 Mighty Demon. I know the engine is running rich so I will just get one of those jet kits from Summit or Jegs and start installing smaller ones until it runs right!
#5
Le Mans Master
#6
Drifting
Carb jetting is usually pretty close. Make changes 2 steps(jet sizes) at a time; 1 step probably wouldn't show enough difference to evaluate. After you figure if you need to go richer or smaller, you can fine tune to 1 jet size.
#7
Team Owner
the ZZ383 and a single plane would probably use a 6.5 PV. single planes need an instant squirter. So set the squirters for instant action.