Holley PCV Question
Thread Starter
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
Holley PCV Question
Installed a Holley 750 with Vacuum Secondaries. My Question is how do you hook up the PCV. There is a small vacuum port on the front of the carb which is manifold vacuum but the port is so small.
I have set up the carb per Lars instructions and changed the vacuum secondaries spring to White. I changed the jets from 70 to 72.
Just wondering about PCV
I have set up the carb per Lars instructions and changed the vacuum secondaries spring to White. I changed the jets from 70 to 72.
Just wondering about PCV
Thread Starter
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
Originally Posted by lars
There should be a 3/8" vacuum port in the rear of the carb throttle plate.
Last edited by spedaleden; Nov 11, 2006 at 12:03 PM.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
I would not T your brake line with the PCV, see if the manifold has a vac port and hook the brakes to that and the PCV to the carb, you want all the vac you can get for the brakes with no chance of PCV valve failure causing problems
Racer
Joined: May 2006
Posts: 264
Likes: 0
From: Fort Myers, Fl / St. Paul, Mn
My Holley has both an 1/8" and 3/8" inch ports on the very front of the carb. They are close together and slanted off to the drivers side. The 1/8" is connected to the vapor cannister and the 3/8" is connected to a tee on the PCV and it then continues to the other port on the vapor cannister.
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
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
In used the 3/8 fitting on the rear of the carb for brake booster. I used the small vacuum port on the front for PCV. I used thin vacuum line with an adapter to 3/8. Went for a ride and everything works fine. Set the floats, mixture and Idle.
I am using the port on the manifold for headlight vacuum. Car is has a 4 speed so only one port for vacuum. I guess I could of put a T-fitting in, buy it's working fine with the way I have it.
Motor is not running so, fuel pressure gauge reads low
I am using the port on the manifold for headlight vacuum. Car is has a 4 speed so only one port for vacuum. I guess I could of put a T-fitting in, buy it's working fine with the way I have it.
Motor is not running so, fuel pressure gauge reads low
