After finishing my fuel pump rebuild , now I am looking at my carburetion situation, I am tryin to figure out two things᠁ 1. What is the unit mounted between the carb and manifold?
2. Where does the fitting go to off side off manifold where their is a T for brake setup..
Whatever goes on end of that fitting was missing when I got the truck.
Will try to draw arrow pointing to it in pic before I add it on here
1952 GMC model 473 dump truck 1951 Chevy 1500 stepside
Tell us what kind of truck and what engine that is. Vacuum assist brakes? 2sp axle?
~~ Jethro 1954 3100 Back to Life In the Dity Gallery 1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
That is a "sandwich" governor, so-called because it is sandwiched between the carburetor and the intake manifold.
A couple of the more common brands were Huff, and Handy. I think (not sure) yours is a Handy.
Cannot help with the fitting.
Jon
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
Kinda looks like the Stromberg carb on my '65 GMC 305 V-6. Best thing I did for that set up was to send the Stromberg and governor to the landfill. Replaced with a Holley 350
~ John
"We are not now that strength which in old days Moved earth and heaven; that which we are, we are"
1948 International Farmall Super A 1949 Chevrolet 3804 In the Legacy Gallery | In the Gallery Forum 1973 IH 1310 Dump 2001 International/AmTran RE3000 "Skoolie" 2014 Ford E-350 4x4 (Quigley)
Looks like others have answered question "1" - a "sandwich" governor per Jon (carbking).
As your picture seems to clearly indicate a GMC 6 cylinder, a little web searching I did may have your answer to question "2" - I believe that fitting you pointed at is were a PCV pipe was connected that was further connected to the valve cover (see the 2 pics attached below on why I came up with this thought).
One of our fellow GMC guru's will hopefully come along and provide confirmation and maybe a bit more detail (or correct me if I'm in error).
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
The T fitting on the intake manifold has a hose going to the rear that is most likely for a hydrovac brake system.
The short piece going towards the front is a PCV valve. There is supposed to be an "S" shaped piece of metal tubing (about 7/16" OD) going from the PCV valve to a 90 degree fitting in the top of the valve cover. The PCV valve is designed to be dismantled, cleaned and re-assembled.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
Kinda looks like the Stromberg carb on my '65 GMC 305 V-6. Best thing I did for that set up was to send the Stromberg and governor to the landfill. Replaced with a Holley 350
John - this one is a Holley!
Jon
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
"We are not now that strength which in old days Moved earth and heaven; that which we are, we are"
1948 International Farmall Super A 1949 Chevrolet 3804 In the Legacy Gallery | In the Gallery Forum 1973 IH 1310 Dump 2001 International/AmTran RE3000 "Skoolie" 2014 Ford E-350 4x4 (Quigley)
I would not be opposed to eliminating the “sandwich” governor and that carb. But if I get a 350 Holley as suggested, how will this affect my braking system? Looks like the vacuum lines are to help with this? When I follow the larger diameter lines ᠁. They go underneath and lead to a large vacuum tank where steel brake lines come out of as well᠁. 🤷â€â™‚ï¸
Can I totally eliminate this type of brake system and just have hydraulic brake setup?
1952 GMC model 473 dump truck 1951 Chevy 1500 stepside
That "large vacuum tank" with brake lines is a Hydrovac brake booster. Yes, it can be eliminated, but you will lose the power brake assist it provides. Better put in some time at the gym doing squats- - - -your legs will need to be in top shape without the power brakes working.
The governor is there to prevent overspeeding the engine in the lower gears, especially if the truck happens to be equipped with a 2 speed rear axle. The engine can rev into dangerous territory almost instantly in the "low" axle range. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Before making any decision on the existing carb and governor configuration, some homework is in order.
Transmission gear ratios Rear end ratio Is the rear end a 2 speed REASONABLE engine red line Rear tire size
Now maximum safe speed for each gear may be calculated.
Should you opt to retain A governor; Holley, Rochester, Stromberg, and Zenith all offered 2 barrel carburetors with INTEGRAL governors.
The integral governor is a part of the carburetor throttle body, rather than a separate unit.
While none of the afore-mentioned units are inexpensive, all (opinion) are more reliable than the sandwich unit (for which parts may or may not be available). (Opinion) the Rochester, Stromberg, and Zenith units are MUCH more reliable.
Homework can save you a BUNCH of money over impulsive purchasing.
Jon
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
Glad to hear there are other governed versions available. I don’t necessarily want to abandon the power assist for the brakes. Wondering if I could retrofit a modern power brake setup from a heavy duty truck?
Possibly a master cylinder/power brake booster combo that might bolt to firewall.
Homework on any custom mod issue always a must, that’s why I am here. Thanks to everyone for the insight.
1952 GMC model 473 dump truck 1951 Chevy 1500 stepside
Hydrovac units have logged untold millions of miles, stopping max gross weight loads (or more accurately, big overloads) for several decades. Why mess with success? Just rebuild the brakes and steering systems to "as new" condition and drive on. "New" and "Modern" doesn't always equal "Better", particularly if you don't happen to be an automotive engineer with millions of dollars' worth of research and development budget at your disposal. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Hot rod, I agree with keepin power assisted brakes, if the rebuild parts are available, and the original system did work well? (Don’t know, never messed with this setup before)
If Zi end up replacing carb with another one that has internal governor᠁.🤔 wondering what provisions I will need to make to keep vacuum supplied to that accumulator tank under cab?
Or if the recently rebuilt vacuum pump will be able to work in conjunction with that system?
I assume the vacuum pump operated off of camshaft is for windshield wipers and maybe other small items that don’t require a lot of vacuum?
Could the brakes benefit from tapping into this supply?
1952 GMC model 473 dump truck 1951 Chevy 1500 stepside
To get back to your #2 original question, I have attached a couple of other photos posted by TUTS 59 of a 1942 GMC engine compartment he spotted/posted in the Stovebolt Spotters Alert forum that better show what the PCV valve and line to the valve cover look like all together.
Also, just a suggestion that your questions about the "brakes" are better asked and discussed in a forum related to that topic (not really on topic for the Engine Shop forum). You haven't told us what your truck is, but based on the described brake equipment, guessing it's probably a GMC "Big Bolt". The best forum to post further questions on your truck is most likely in the Big Bolts forum.
Hope this info and the bit of redirection for further questions helps you get the answers you need for your truck.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
One other suggestion that will help fellow Bolters answer your questions - tell us what your truck* is please and thanks.
* You can add the basic truck details into your profile signature line and it will show up in every post you make. Saves a ton of time and typing.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
