C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

proportioming valve tool

Thread Tools
 
Search this Thread
 
Old Jun 30, 2025 | 09:15 PM
  #1  
Old Hotrodder's Avatar
Old Hotrodder
Thread Starter
Heel & Toe
 
Joined: Feb 2024
Posts: 20
Likes: 3
Default proportioming valve tool

I have installed Wilwood calipers and master cylinder and I'm ready to bleed the system. I want to use the proportioning valve tool to keep the rod centered, but all the ones I've seen are 1/2 inch. The stock one is 7/16 thread. Where do I get one that fits?
Reply
Old Jun 30, 2025 | 09:53 PM
  #2  
MelWff's Avatar
MelWff
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 18,648
Likes: 2,557
Default

Originally Posted by Old Hotrodder
I have installed Wilwood calipers and master cylinder and I'm ready to bleed the system. I want to use the proportioning valve tool to keep the rod centered, but all the ones I've seen are 1/2 inch. The stock one is 7/16 thread. Where do I get one that fits?
What year? Willcox showed for 69 to 73 7/16-20 and 74 up 1/2-20.
Image
Reply
Old Jul 1, 2025 | 10:38 AM
  #3  
Old Hotrodder's Avatar
Old Hotrodder
Thread Starter
Heel & Toe
 
Joined: Feb 2024
Posts: 20
Likes: 3
Default prop valve tool

Wilcox is correct. Mine is a 73 and it is 7/16-20. I just can't find anybody that sells one that isn't 1/2-20.
Reply
Old Jul 1, 2025 | 10:50 AM
  #4  
signify's Avatar
signify
Burning Brakes
Community Builder
Conversation Starter
All Eyes On Me
 
Joined: Oct 2020
Posts: 854
Likes: 71
Default

i also need one for my 77 what size is mine?
Reply
Old Jul 1, 2025 | 12:15 PM
  #5  
Joey_SS's Avatar
Joey_SS
Racer
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jan 2024
Posts: 277
Likes: 103
Default

Originally Posted by signify
i also need one for my 77 what size is mine?
You dont need one.
Reply
Old Jul 1, 2025 | 12:15 PM
  #6  
MelWff's Avatar
MelWff
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 18,648
Likes: 2,557
Default

Originally Posted by signify
i also need one for my 77 what size is mine?
1/2-20
Reply

Get notified of new replies

To proportioming valve tool





All times are GMT -4. The time now is 01:53 PM.

story-0
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-1
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-2
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-3
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-4
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-5
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-6
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-7
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-8
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-9
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE