'69 L46 Jets
Thread Starter
Pro
Joined: Jun 2010
Posts: 620
Likes: 18
From: Travelers Rest, SC
'69 L46 Jets
For the 3-1/2 years that I've had my '69 L46 coupe I've been fighting a good amount of detonation to the point where pulling out enough timing to prevent it would cause the car to run like crap. So I did some research and saw that L46's came with 66 jets from the factory and looking at what other cars came with, 66's seemed small. Figured I'd pull apart my Quadrajet to see what's in and sure enough 66's were in the carb. I replaced them with 70's yesterday and my car has never run better! I no longer get ANY part/mid throttle detonation that I used to, it's amazing, sad to say!
My question is, why did these cars come with 66 jets (smallest that I know of available for a Quadrajet) for a performance car? Was it that they were fine with the fuel that was available back when she was new?
My question is, why did these cars come with 66 jets (smallest that I know of available for a Quadrajet) for a performance car? Was it that they were fine with the fuel that was available back when she was new?
Race Director
Joined: May 2006
Posts: 18,736
Likes: 2,582
Racer
Joined: Aug 2013
Posts: 264
Likes: 58
From: Virginia
Thread Starter
Pro
Joined: Jun 2010
Posts: 620
Likes: 18
From: Travelers Rest, SC
source for jets
http://www.summitracing.com/search/b...ibanner=SREPD5
http://www.summitracing.com/search/b...ibanner=SREPD5
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
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
For comparison, my 70 L-46 carb was rebuilt by Lars and he used, 70 or 76 Main Jets (his hand writing was hard to read on that last digit), 43 Main Metering Rods and BA Secondary Metering Rods.
Last edited by Revi; Oct 31, 2015 at 09:58 AM.
Thread Starter
Pro
Joined: Jun 2010
Posts: 620
Likes: 18
From: Travelers Rest, SC
Thank you for the info, my carb had BG secondary rods in it and I stepped down to DF rods (next step richer) and helped out with detonation, still getting some at WOT though.
Race Director
Joined: Sep 2005
Posts: 18,640
Likes: 121
From: Farragut,TN
For the 3-1/2 years that I've had my '69 L46 coupe I've been fighting a good amount of detonation to the point where pulling out enough timing to prevent it would cause the car to run like crap. So I did some research and saw that L46's came with 66 jets from the factory and looking at what other cars came with, 66's seemed small. Figured I'd pull apart my Quadrajet to see what's in and sure enough 66's were in the carb. I replaced them with 70's yesterday and my car has never run better! I no longer get ANY part/mid throttle detonation that I used to, it's amazing, sad to say!
My question is, why did these cars come with 66 jets (smallest that I know of available for a Quadrajet) for a performance car? Was it that they were fine with the fuel that was available back when she was new?
My question is, why did these cars come with 66 jets (smallest that I know of available for a Quadrajet) for a performance car? Was it that they were fine with the fuel that was available back when she was new?
Race Director
Joined: Sep 2005
Posts: 18,640
Likes: 121
From: Farragut,TN
