What timming and jets should i run.
Thread Starter
Le Mans Master
Joined: Nov 2004
Posts: 6,434
Likes: 0
St. Jude Donor '07
What timming and jets should i run.
im running around 35-36 degrees. in my carb i have 92 jets! 
i boguth the car it was origanaly like a nascar or late model carb i bought form a nascar surplus store. my motor is a 355 like 11:1 compression, hydualic roller .550 lift cam both exhaust and intake, 236* at .50 lift, heads are flowed and im running victor and 750 cfm double pumper.what whould you guys recomend i know the timing is pretty much right but i was wondering about the jets mostly.
i boguth the car it was origanaly like a nascar or late model carb i bought form a nascar surplus store. my motor is a 355 like 11:1 compression, hydualic roller .550 lift cam both exhaust and intake, 236* at .50 lift, heads are flowed and im running victor and 750 cfm double pumper.what whould you guys recomend i know the timing is pretty much right but i was wondering about the jets mostly.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Originally Posted by VETDRMS
I am running a BG Mighty Demon 750 with 72/82 jets on my 406.
If you run a power valve you will want to step your jetting. A PV adds 8-10 jet sizes when needed.
If you run a power valve you will want to step your jetting. A PV adds 8-10 jet sizes when needed.
As to the jet size differential with and without a PV, it varies by the carb's calibration. It's anywhere from 6 to 15 jet sizes depending on the PV channel restrictors.
Though, it's a self-inflicted wound to defeat a feature that is intended to make the carb more suitable for part throttle driveability, which is where a street carb spends 95 percent of its time.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Le Mans Master
Joined: Nov 2004
Posts: 6,434
Likes: 0
St. Jude Donor '07
Originally Posted by gerry72
Though, it's a self-inflicted wound to defeat a feature that is intended to make the carb more suitable for part throttle driveability, which is where a street carb spends 95 percent of its time.
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
I would go with a similar setup like vetdrms..
I actually had the exactly same jetting on my old 383 and it worked fine... 72 primary and 82 secondary jets..
On my 1000 cfm carb, I'm running 84 primary and secondary jets...
I'd try to go with 38 degrees timing.. 350's and 383's seem to like a bit more timing.. My 406 runs better with 36 degrees... but my 383 loved 38 degrees...
I actually had the exactly same jetting on my old 383 and it worked fine... 72 primary and 82 secondary jets..
On my 1000 cfm carb, I'm running 84 primary and secondary jets...
I'd try to go with 38 degrees timing.. 350's and 383's seem to like a bit more timing.. My 406 runs better with 36 degrees... but my 383 loved 38 degrees...
Last edited by GrandSportC3; Jul 27, 2005 at 10:47 AM.