carb jetting
Thread Starter
7th Gear
Joined: May 2007
Posts: 7
Likes: 0
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.
Drifting
Joined: Aug 2001
Posts: 1,606
Likes: 14
From: Vacaville, CA
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! 
Le Mans Master
Joined: Feb 2002
Posts: 5,407
Likes: 1
From: HONOLULU HAWAII
Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
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.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
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.
