which carb to buy

[bill]

With my engine, a stock 350sbo, #6 heads..it runs great with the 500cfm 2bbl rochester. Excellent throttle response and cranks with just a touch of the pedal and a bump of the starter. Unless I go with a lot more performance upgrades, or plan to drive across the country, I wont be removing it to add a 4bbl intake and carb. Just seems to me to be a waste of expensive gas....jmo of course..

Technically, a Qjet gets better milage and throttle responce than most 2 barrel carbs because the primaries on the Qjet are smaller. Truthfully a 2 barrel has nothing to offer over a Qjet in any way except the fact you may not actually currently own a Qjet.

In my experience....Ive had better performance with the 2bbl than with the 4bbl on stock sbo's. Unless the motor is built to require the carb/intake set up, adding it wont do much to improve the performance on its own. No need to add cfm's if the engine cant use it. Now, if I had changed the cam, added larger valves, and increased CR...I could see the need and would have added it. True, I may get a few more mpg's with the 4bbl, but once the 4bbl opens up, that ratio drops below the 2bbl.... in 1970, the stock build of this engine called for the 2bbl...so its built to run in that manner.

 

[Cutty1]

confused

ok another question how do you know if the carb is setup for auto trans? some i find they will say used with manual only what does that mean

 

[Cutty1]

m4mc or 4mc r2 or r4???

http://www.carbkitsource.com/carbs/cata ... index.html ok which year would be best with auto 350 3sp

 

[Clone TIE Pilot]

Re: m4mc or 4mc r2 or r4???

http://www.carbkitsource.com/carbs/catalog/Oldsmobile/index.html ok which year would be best with auto 350 3sp

Those are not very complete kits for the price, why don't you try Cliff's?

http://www.cliffshighperformance.com/carbkits.html#

He has a $34 kit that is better than the carbkitsource's kit, and has a complete kit for $79 that is way better than that other site's kits.

 

[Cutty1]

i dont have a carb to rebuild i need a replacement

 

[Cutty1]

carb choice

can i get a carb lets say 72 for 455 to put on a 350? or does it have to say for 350 i trying to find right carb an buy it once not twice thanks guys

 

[DRIVEN]

Generally speaking a pre-smog 350 Chevy carb will run well on a pre-smog 350 Olds, etc. Not so much when using one from a 472 Cadillac or smog 305.

Carbs are jetted for the engine displacement. A 455 carb will run on a 350 but be pig rich. A 455 carb could be recalibrated for a 350 but why bother. Cragslist is full of Qjets iff of 350s which are much more common than a 455. You should be able to use a carb from a 350 Chevy, 350 Buick, 350 Pontiac or 350 Olds. The jetting will be pretty close if you Olds 350 is pretty stock. Again, look for a pre-'74 one that has a 70XXXX number as opposed to a '74-up carb that starts with 170XXXX.