The Stovebolt Site Forums The Shop Area Engine Shop carb

does anyone know if the single barrel rochester carb. on a 235 engine is the same as the carb on a 228 GMC engine? Is the bolt pattern where the carb bolts to the intake the same?
Dave

What year 228?
What size GMC?

Typically, the GMC carburetor would have been a Zenith (and, maybe a Holley)?

The bolt patterns might match.

What year 235 manifold?

Its in a 50 GMC suburban. Just bought the 235 and it needs a carb. I thought maybe the carb on the 228 might work on the 235. Thanks for the shout-back.
Dave

i belive the gmcs share carbs with 216s and early 235s. if you have a full pressure 235 ( with four bolts around the valve cover).
then the bols will be spaced out wider then your 228 zenith. so.. you can
1. get a carb for a 235,
2. ive heard of ppl fileing out the holes on the throttle body base, but i would want to ruin A good zenith.
3. swap manifolds. you need to get the stepped alignment rings. im assuming the 228 manifold fit fit you might want to investigate your self before going that route.

If i had the 228, id keep the carb to go with it, then find a 235 carb used for 60-80 bucks.

you'll need to fab a front mounting plate as well cause the 235 will be shorter.

A 228 manifold will not fit a 235.

good to know it dosent fit. he could use a 216 manifold on his 235 with his 228 carb right?

the 216 carb is different than the 235. bolt pattern is different. I want to use the carb thats on the 228 (GMC) and put it on the 235 intake. Bolt pattern is 2 15/16" bet the bolts that fasten carb to intake.

The flange size for a 1950 Chevrolet 235 should be S.A.E. size 3, that is center to center bolt spacing of 2 15/16 inches.

G.M.C. used dozens of different carburetors on different year and application 228 engines. ALL that I have information on are ZENITH size 10 and 11.

Zenith had intermediate sizes; but both the Zenith size 10 and size 11 correspond to an S.A.E. size 2 flange which is 2 11/16 center to center.

The throttle bore on the Zenith size 11 is slightly larger than the Zenith size 10; again BOTH are 2 11/16 center to center.

The Zenith corresponding to S.A.E. size 3 would be Zenith size 12.

If you have a good G.M.C. 228 Zenith carb, perhaps you could find a Chevrolet 216 intake and use the Zenith carb.

Jon.

thanks for the info. So does the 216 manifold bolt up to a 235 without any alterations? Can I use just the intake? Also, could I use the zenith size 10,11 with the 216 manifold? How do you tell the different sizes of the Zenith carbs? Appreciate the help.
DAve

The 216 mani bolts up to the 235 but you have to find stepped ailment rings.
I had a 216 manifold attached to my 235 when I got it and they did not use the correct stepped rings they just had the 216 rings. That must have been a pain to put on