'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: 18,662
Likes: 2,563
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
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
