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Thread: Master cylinder bore size
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03-06-2021 #1
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Master cylinder bore size
Good afternoon,
Looking for opinions on m/c bore size. I have c6 2 piston calipers front, c4 single piston calipers on the rear. I just redid all of the hard lines and new prop valve. The car is a g body which has a stock size of 7/8. Thinking of using a b body master I have that is 1 1/8. Any thoughts? Than you.
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03-06-2021 #2
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The later C4's, C5's, and C6's came with 1" bore master cylinders. Assuming you're going with vacuum assist, I wouldn't deviate from 1". Make sure you install an adjustable proportioning valve for the rears as well
- Ryan
03-07-2021 #3
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Power brakes or manual?
Andrew1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
My YouTube Channel Please Subscribe!
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Dr. EFI
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"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
03-07-2021 #4
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Originally Posted by stab6902
Thay makes sense, didnt think about that. Thank you
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Power Originally Posted by andrewb70
03-07-2021 #5
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I'd do a right hand drive S10 1" bore MC. Details in my GTO v3 update thread. Originally Posted by 1985olds
1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
My YouTube Channel Please Subscribe!
Instagram @projectgattago
Dr. EFI
I deliver what EFI promises.
Remote Holley EFI tuning.
Please get in touch if I can be of service.
"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
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