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#1 |
Registered User
Join Date: Sep 2020
Location: Osborne
Posts: 16
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Vacuum boost brake conversion
I have a 72 c10 with a 350. It has disk brakes on front and drums on rear.
I want to convert to vacuum boosted brakes for better stopping. I have been looking on Summit Racing and Jegs for the combo. master cylinder, vacuum, proportioning valve, etc. I see that there are different diameter vacuum boosters. 11 inch and 9 inch. Thought I read that some guys ran into a conflict where the booster was too big and causing problems. So with a 350, what size should I get? Thanks. |
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#2 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 758
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Re: Vacuum boost brake conversion
11" will work with an SBC but with some headers some go with 9" for better clearance. If you have a camed motor that makes low vacuum go with 11" or a dual chamber 9"
With that said I have a single 9" on my 67 SBC Camaro running a camed motor making 12" of vac, no problem I have a Right Stuff conversion |
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#3 |
Registered User
Join Date: Jun 2016
Location: Bremerton, WA
Posts: 171
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Re: Vacuum boost brake conversion
Taller aftermarket valve covers and Big Blocks (taller deck) can have issues with the 11" booster. The 11" should still fit but it may not be possible to pull the valve cover off without removing the booster.
If you have a BBC or tall valve covers, you should be able to unbolt the booster with the master cylinder and move it aside without unhooking the brake lines if you are careful.
__________________
1969 Custom Camper C20; Factree Air, 350/TH400/Dana 70U with C30 wheel cylinders, Disk brakes, H4 conversion, headlight relay mod, 3G 135 amp alternator. 7500 GVW |
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