diff. gears ('34 streetrod truck)
vacuum pressure
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 39
Likes: 0
From: Dallas Texas
vacuum pressure
1969 base 350. If I measure the vacuum pressure at the manifold, what is the acceptable range of pressure. I am sure this is posted hundreds of times, but I couldn't find it through multiple searches
Thanks
Thanks
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
With a stock 350/300, you should see close to 20" hg and steady at idle. What you actually get depends upon the carburetor adjustment and where your initial timing is set. Below 18" hg suggests a problem in your tuneup and you want to check your ignition timing and your carburetor idle mixture adjustment.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
If you are new to using a vacuum gauge, here is a good article to read:
http://www.secondchancegarage.com/public/186.cfm
Scott
http://www.secondchancegarage.com/public/186.cfm
Scott
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 39
Likes: 0
From: Dallas Texas
Bought a vacuum gauge and followed the instruction on secondchancegarage. Reset the timing based on the recommendation. Vacuum at 21 now. I thought the car was correctly timed and running well. Huge improvement in performance. Thanks
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
If you are new to using a vacuum gauge, here is a good article to read:
http://www.secondchancegarage.com/public/186.cfm
Scott
http://www.secondchancegarage.com/public/186.cfm
Scott
excellent read
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