Call Carbking (Jon Hardgrove) at his office. He'll set you up with the exact kit you need:
The Carburetor Shop: 573-392-7378
The kit you show says it doesn't come with ???? for 235. What doesn't it come with?
1950 Chevrolet 3100 (Ol' Roy) 1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
They've rebuilt at least half a dozen carburetors for me in the last 20 years. They also sell rebuild kits.
1950 Chevrolet 3100 (Ol' Roy) 1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
I`m also hunting the pinion seal for this truck. 10 bolt.Is this right? https://www.oreillyauto.com/detail/c/masterpro-bearing-seal/masterpro-multi-purpose-seal/mpb0/5778/v/a/116621/automotive-truck-1958-chevrolet-truck?q=1958-1959+Pinion+Seal+For+Differential+Housing+1%2F2T+Posi-Trac+Chevrolet+and+GMC+Pickup+Truck&pos=1
BD - Is your differential a Posi-Trac unit??? That seal description says for Posi-Trac.
If your's isn't a Posi-Trac equipped differential, you need this seal instead.
~ 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)
A check of GMPartswiki shows the original part was GM# 3776800 (later replaced by GM# 3865358). Those GM#s cross reference to a National Seals 6818.
Although O'Rielly's web vehicle list checker says their 5778 fits your truck, a check through other source listings say it does not. A check of the PN 6818 shows they carry a Precision 6818 which shows as a match for your truck. That the one you should find will fill your need.
Note: A dimensions check between the National and Precision 6818 data shows the exact same specs for both seals.
Last edited by Gdads51; 05/09/202510:57 PM. Reason: add note
~ 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)
I got the seal out. Looks good. This flexible wire loop was in there. I`m guessing it was part of the original pinion seal? or does it go in around the pinion? The nut was 1 1/8
That springy thing would go around the inside of the seal lip to put a little pressure on the lip. Check the replacement seal - it will likely have a springy thing at that position.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Looks like I'll replacing the steering column. Too much play. It has a leak somewhere. I replaced the gasket. IDK maybe a crack. I have a nice replacement I took out of the 59 when I switched to PS. I took it out on the highway at 55mph. Rides good. Shifts nice. Speedo works! Tires balanced. Stops! I climbed a high dirt hill in 1st. Not much problem. Engine seems to lack ACCEL in 3rd at 45-50mph and start off in 1st.
I really like my blinker can makes that "clickin" noise. Finished up that high and tight welding up under the dash. Welding blanket and water. That old firewall insulation would go up quick. Put in the rubber flooring mat.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
Lots of possibilities BD. Could be failed piston rings, blown head gasket, sticking valves amongst other things. Previously you said it was recently rebuilt by a shop. You need to begin investigating these different possible conditions, but may also want to reach out to the shop on what if any warranty they offered.
You've already checked basic compression. Time to pull the valve cover and check for full valve opening/closing and then probably do a "leak down" test as that will help better ID where your loss of compression is coming from. Probably better to post about this in the Engine Shop to get the best visibility and responses back on whats going on.
~ 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)
Lots of possibilities BD. Could be failed piston rings, blown head gasket, sticking valves amongst other things. Previously you said it was recently rebuilt by a shop. You need to begin investigating these different possible conditions, but may also want to reach out to the shop on what if any warranty they offered.
.This is a 1957 235. Not the original 235 from 1958. not been rebuilt leak down test next week
I`m on the fence about just cutting my losses with the 235 and find a SBC to put in there. Eventually I will sell the truck. Not sure what to do. I do know that I`ll get run over trying to pull out of my property onto the highway with the 235. Modern traffic does not want to wait on me. Looks like a rebuild is in order. I remember the previous owner said his wife wanted it out of her Bel aire because it lacked power. That was 30+ years ago and all the engine did was sit since then. It'll fire up if you just show it the key. Which I like, but lack of power in todays world. IDK. The price of a rebuild, if I can find someone that even wants to do it, might be close to cost of a SBC. Plus I have many new parts for those. What do you guys think? With a rebuild, will the 235 keep up with today?
If it is just a head gasket issue, getting those other two cylinders up to 75psi will make a big difference. It won't be a screamer but it will be a lot better than it is now.
1950 Chevrolet 3100 (Ol' Roy) 1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
My 235 is from a ‘59 passenger car, 135HP and is really peppy. Your ‘58 has 145HP so it should be even better. Even your good cylinders are really low at 76 lbs. According to a 1961 Motors Truck manual, a compression ratio of 8:1 should have a compression of 140 lbs. Your engine, if it truly is a ‘58 235 has a ratio of 8.25:1. Rebuild it and I believe you’ll be fine.
Last edited by Phak1; 07/03/20251:14 AM. Reason: Typo
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
My 235 is from a ‘59 passenger car, 135HP and is really peppy. Your ‘58 has 145HP so it should be even better. Even your good cylinders are really low at 76 lbs. According to a 1961 Motors Truck manual, a compression ratio of 8:1 should have a compression of 140 lbs. Your engine, if it truly is a ‘58 235 has a ratio of 8.25:1. Rebuild it and I believe you’ll be fine.
Let me ask you this Phil. I`m delayed with a leak down test and wondering how well that will narrow down my problem. With the compression being low and lower. I`m thinking whatever repairs the engine would need ,the engine would have to be removed. Debating on just lifting the engine out and not doing a leak down test. thoughts?
If it was my project, I would pull the engine. It doesn’t take much effort to pull these old Stovebolts and it would make diagnosing the issue much easier. Only after you find the extent of your problems can you make an educated decision on how to proceed.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
I`d try a leak down test on my own, but not sure what to listen for and where. I have a good friend that thats his business..engines. But the season is now that keeps him busy. I put the engine in myself w/ bell housing. That was a nail biter as I had to tilt the motor to lower it in. If i were to pull it, I`d have to have help. You should have seen me lowering it in. Tilting up + turning with one hand. Lowering the picker with the other. Not fun.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
With everyone in the world swapping to LS engines , the old SBC have gotten pretty reasonable. Don't get me wrong, I am all about keeping the 235 but if it's a matter of economics, you need to do what will bring the most at sell time.
I would at least open up the 235 and see what is going on, it may be as Otto suggests and just need a head gasket.
~ Craig 1958 Viking 4400 "The Book of Thor" Read the story in the DITY 1960 Chevrolet C10 "A Family Heirloom" Follow the story in the DITY Gallery '59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
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