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51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB #1250294
Wed Jan 10 2018 03:37 AM
Wed Jan 10 2018 03:37 AM
5
51chris  Offline OP
Shop Shark
Joined: Sep 2012
Posts: 98
peabody ma
See the link. Customized an intake as I did not want to use the original updraft carburetor, however there was no room to run a downdraft. Finally got it running. Appears to run strong, no lag.
The last frame is a short video.
Thanks
Chris

https://photos.google.com/share/AF1...Y09Tdll5N0NGUjJ1QjVwQmh0M1NmMVMxMkFzcVdB

Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250313
Wed Jan 10 2018 06:05 AM
Wed Jan 10 2018 06:05 AM
Y
yellosub54  Offline
Shop Shark
Joined: Aug 2003
Posts: 147
sonora, ca
You do nice work. That two barrel should help. Congrats on getting her running. I'm especially fond of the yellow engine!!
Yellow forever!!


"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.

Robert
55.1 GMC 450 COE
51ish GMC Suburban
Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250335
Wed Jan 10 2018 04:12 PM
Wed Jan 10 2018 04:12 PM
69Cuda  Offline
Big Bolt Forum Moderator
Joined: Dec 2015
Posts: 1,499
Seattle, Wa.
cool! looking forward to seeing more pics as you progress!


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof
Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250338
Wed Jan 10 2018 04:45 PM
Wed Jan 10 2018 04:45 PM
tclederman  Online
Boltergeist
Joined: Sep 2001
Posts: 27,560
Jarvisburg, NC
Very nice set of photos, Chris

You are doing a great job of bringing this to drivability.

Nice looking 261 you are putting into it. You probably know that yellow was a 261 truck engine color for several years? Was that one yellow originally (not that it matters)?

It looks like you are not relocating the water pump? Do you have a short-shaft pump, or, is there enough room in a COE for that water pump?

Sorry about the questions.

You have more motivation than I do. Your COE will probably be running before mine will.

Keep at it - we'll enjoy seeing your progress photos.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 47 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250414
Thu Jan 11 2018 02:11 AM
Thu Jan 11 2018 02:11 AM
5
51chris  Offline OP
Shop Shark
Joined: Sep 2012
Posts: 98
peabody ma
Hi Tim
A lot of the pics show the regular water pump. When we installed the radiator, The shaft was to long so I did buy the kit and installed the relocation plate and 216 water pump. As for the yellow, I bought two cans of yellow from caterpillar(what quality paint). The 261 was original yellow which came out of I think a 56 truck. I wanted the yellow to be reminiscent of a diesel!
We will be starting on the body in about a month. I am still on the fence on cutting two feet off the frame. If I do should I cut it off on the back and move the axle up or behind the cab?
Thanks for your interest.
Chris

Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250418
Thu Jan 11 2018 02:50 AM
Thu Jan 11 2018 02:50 AM
E
EdPruss  Offline
Shop Shark
Joined: Jun 2011
Posts: 2,170
Longmont, CO
If one cuts it in a straight section just behind the cab, all the running gear, axle, springs, cables, brake, etc. parts will not have to be repositioned, not a small task. Just make sure of a straight section.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'52 GMC 630 w/ 603 gasser, ex fire truck.
Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250476
Thu Jan 11 2018 05:11 PM
Thu Jan 11 2018 05:11 PM
S
spanky  Offline
Shop Shark
Joined: Dec 2002
Posts: 4,280
burlington, n.c.
Chris, It already looks like your truck is the medium 134in. wheelbase. How short do you need it ? What type body are you installing ? 47-54 Chevy COE's came in three wheelbases, 110in., 134in., and 158in. I shortened a 158in. wheelbase COE, down to a 134in. wheelbase, by cutting the frame just to the front of the rear most cross member, then cutting the frame again just to the front of the middle cross member, removed that 24in., section, then welded the two sections back together. I only had to remove the center drive shaft, and reconnect the brake line, but everything else lines back up.


Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery
Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: 51chris] #1250800
Sat Jan 13 2018 06:07 PM
Sat Jan 13 2018 06:07 PM
C
CmdrGeo  Offline
Shop Shark
Joined: Dec 2011
Posts: 101
Phoenix, AZ
Chris, I want to echo everybody else's comments. Great job. I've had my truck for years and it still looks like all your before shots. And if you're going to cut it, I say go 110". At that length, an 8' bed fits just right and it's sure a lot easier to maneuver around.

Geo

Re: 51 COE UPDRAFT CARB CONVERSION TO DOWNDRAFT CARB [Re: CmdrGeo] #1250850
Sun Jan 14 2018 01:22 AM
Sun Jan 14 2018 01:22 AM
5
51chris  Offline OP
Shop Shark
Joined: Sep 2012
Posts: 98
peabody ma
Hey all, Thanks much for the input.
I will finish the body, get it running then decide. Reason to shorten the frame would be maneuverability, and looks. Should not be to hard after, brake line, drive shaft. Not a big deal.
The other major decision (person preference) is picking the color, black, 2014 fj cruiser trail teams heritage blue, or ????
Thanks
Chris


Moderated by  69Cuda, Grigg 

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