vaccuum booster with 1barrel carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

primetime · 03-30-2010, 10:43 PM

is this possible. my truck is a L6 with 1 barrel carb. 250ci. the truck has disk brakes but i'm looking to upgrade to power disk near future. i'm going to get a kit that has drop spindles. so, can a 1 barrel carb produce enough vaccuum to operate a power brake system?

PDW HOTRODS · 03-30-2010, 11:08 PM

The engine makes the vacume, need to find or install another vacume port somewhere.

68GMCCustom · 03-30-2010, 11:25 PM

find or make (drill and tap) a port in the intake manifold?

SCOTI · 03-30-2010, 11:34 PM

Very possible as they said. I had power discs on my 68 w/a 250/3spd.

Tx Firefighter · 03-31-2010, 06:37 AM

Every inline 6 I have ever seen had a fitting on the intake manifold below where the carb mounts just for the brake vacuum fitting. GM sold them with power brake option forever. You're good to go.

primetime · 03-31-2010, 12:51 PM

but was it vaccuum booster or was it hydroboost?

primetime · 03-31-2010, 12:53 PM

Quote:

Originally Posted by SCOTI

Very possible as they said. I had power discs on my 68 w/a 250/3spd.

but was it vaccuum booster or was it hydrobooster

Tx Firefighter · 03-31-2010, 12:53 PM

Vacuum. They even made special offset air cleaners so it would clear the brake booster.

Here is my old truck with one on it.

primetime · 03-31-2010, 12:54 PM

Quote:

Originally Posted by Tx Firefighter

Every inline 6 I have ever seen had a fitting on the intake manifold below where the carb mounts just for the brake vacuum fitting. GM sold them with power brake option forever. You're good to go.

i will double check the area when i get off work today. thanks

SCOTI · 03-31-2010, 06:17 PM

Quote:

Originally Posted by primetime

but was it vaccuum booster or was it hydrobooster

Vacuum boost w/discs all swapped over. I couldn't find the offset air cleaner like TxFirefighter had so I used a smaller aftermarket set-up for a 1-barrel carb.

primetime · 03-31-2010, 09:25 PM

i looked at mine awhile ago and couldn't come up with a vaccuum source, yet. i did however find lots of leaks. s#!t. can someone post a side picture of their L6 so i can see the area they are using?

Chevydude56 · 04-01-2010, 12:30 AM

Picture of my 292 , I think the power power was added .

primetime · 04-01-2010, 10:22 AM

Quote:

Originally Posted by Chevydude56

Picture of my 292 , I think the power power was added .

wow. you just made my engine look like garbage. one day it will be nice as yours though.

Chevydude56 · 04-01-2010, 11:29 PM

Thanks . it's a "spray can rebuild" I took the manifolds off to replace the gaskets and thought I would sandblast and paint them while off... then had to clean the block and paint that...took off valve cover sandblast and paint, all with spray cans .one thing just led to another. Found the air cleaner at local pick n pull more spray can paint . Here's the before

DWright · 04-02-2010, 03:40 AM

old setup...

03-30-2010, 10:43 PM	#1
primetime Registered User Join Date: Jul 2006 Location: Columbia, SC Posts: 410	vaccuum booster with 1barrel carb is this possible. my truck is a L6 with 1 barrel carb. 250ci. the truck has disk brakes but i'm looking to upgrade to power disk near future. i'm going to get a kit that has drop spindles. so, can a 1 barrel carb produce enough vaccuum to operate a power brake system? __________________ 1968 Chevy C10 swb fleetside 2005 Chevy Silverado crew cab (SS) 1977 Goldwing cafe racer 1977 Chevy nova (first car/ first love)

03-30-2010, 11:08 PM	#2
PDW HOTRODS Registered User Join Date: Nov 2006 Location: Sutherlin Oregon Posts: 502	Re: vaccuum booster with 1barrel carb The engine makes the vacume, need to find or install another vacume port somewhere.

03-30-2010, 11:25 PM	#3
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: vaccuum booster with 1barrel carb find or make (drill and tap) a port in the intake manifold? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

03-30-2010, 11:34 PM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,071	Re: vaccuum booster with 1barrel carb Very possible as they said. I had power discs on my 68 w/a 250/3spd. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

03-31-2010, 06:37 AM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: vaccuum booster with 1barrel carb Every inline 6 I have ever seen had a fitting on the intake manifold below where the carb mounts just for the brake vacuum fitting. GM sold them with power brake option forever. You're good to go. __________________ I'm on the Instagram- @Gearhead_Kevin

03-31-2010, 12:51 PM	#6
primetime Registered User Join Date: Jul 2006 Location: Columbia, SC Posts: 410	Re: vaccuum booster with 1barrel carb but was it vaccuum booster or was it hydroboost? __________________ 1968 Chevy C10 swb fleetside 2005 Chevy Silverado crew cab (SS) 1977 Goldwing cafe racer 1977 Chevy nova (first car/ first love)

03-31-2010, 12:53 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: vaccuum booster with 1barrel carb Vacuum. They even made special offset air cleaners so it would clear the brake booster. Here is my old truck with one on it. Attached Images __________________ I'm on the Instagram- @Gearhead_Kevin

03-31-2010, 09:25 PM	#11
primetime Registered User Join Date: Jul 2006 Location: Columbia, SC Posts: 410	Re: vaccuum booster with 1barrel carb i looked at mine awhile ago and couldn't come up with a vaccuum source, yet. i did however find lots of leaks. s#!t. can someone post a side picture of their L6 so i can see the area they are using? Attached Images __________________ 1968 Chevy C10 swb fleetside 2005 Chevy Silverado crew cab (SS) 1977 Goldwing cafe racer 1977 Chevy nova (first car/ first love) Last edited by primetime; 03-31-2010 at 10:06 PM.

04-01-2010, 12:30 AM	#12
Chevydude56 Registered User Join Date: Sep 2009 Location: Syracuse NY Posts: 110	Re: vaccuum booster with 1barrel carb Picture of my 292 , I think the power power was added . Attached Images __________________ 1967 Suburban 292 3spd 1964 Chevy II wagon 1971 Monte Carlo 402BB 1964 Cadillac series 62 2dr 1964 Bonneville 2dr/ht 1967 GTO 1978 Chevy Van 30 1989 R30 Crew Dually Bonus Cab

04-01-2010, 11:29 PM	#14
Chevydude56 Registered User Join Date: Sep 2009 Location: Syracuse NY Posts: 110	Re: vaccuum booster with 1barrel carb Thanks . it's a "spray can rebuild" I took the manifolds off to replace the gaskets and thought I would sandblast and paint them while off... then had to clean the block and paint that...took off valve cover sandblast and paint, all with spray cans .one thing just led to another. Found the air cleaner at local pick n pull more spray can paint . Here's the before Attached Images __________________ 1967 Suburban 292 3spd 1964 Chevy II wagon 1971 Monte Carlo 402BB 1964 Cadillac series 62 2dr 1964 Bonneville 2dr/ht 1967 GTO 1978 Chevy Van 30 1989 R30 Crew Dually Bonus Cab

04-02-2010, 03:40 AM	#15
DWright Shlong Bed Club Join Date: Apr 2009 Location: Milford, VA Posts: 220	Re: vaccuum booster with 1barrel carb old setup... Attached Images __________________ "If it ain't broke, hit it with a hammer, then fix it.."



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