Best jet size for twin carbs on a 53 chevy?

Hi guys,

i need some advice for my brother over here in the uk
Hes running twin rochesters carbs on a offenhauser inlet on his 235 ci , Problem is it seems to be really over fueling, Has anyone got any advice on what jet sizes to use, i expect there still using the orginal jets hence the over fueling


thanks guys

 

TTT..someone should know. Maybe there's a way to run on a single carb until you get get down on it.

 

Hey D. DOYLE is he running a heat plate to his manifold?

 

Here's a couple useful links:

http://www.inliners.org/tech/tech4.html

http://www.thecarburetorshop.com/RochestermultipleB.htm

 

Generally, overfueling with the Rochesters is a direct function of warped casting causing the power valve(s) to be open all of the time. (Read the article in the link posted by Curt).

We have found generally that LARGER jets are required on dual set-ups rather than smaller ones.

Jon.

 

Vary Goode Info, been wonderin' Myself, But was Afraid To Ask !
Found that the 235 engines Don't git the Good Fuel Mileage one wood EXPECT !
My dad's '51 Ford Got 21 mpg Hiway, and A friend and I got 21 mpg in his '49 ferd Woodie (on A 6,000 mile Trip ! ) when we visited Bill Harrah's Auto Display in Reno, Before Holiday Inns Bought The Casinos. Oh yeah,
We watched "Evil " smack the wall, at Snake River Canyon, on that Trip.

Keep On a' Smokin'

 

Wellllll,,, My 235 in a 54 and two Roch B's can get 25 mpg on the highway. #52 in both. I had been as large as 68's and the mileage was down to 16. But the top end power was better being rich. Lean drives better for normal driving.