What size Carb. ???????

[Supreme70]

Ok I have a stock 87 350 Chevy that i might be putting a towing cam in and add some headers come warm weather. My Question is what would be best for the motor. I have three 600 cfm single pump holley's, a 750 cfm single pump holley and a 650 cfm double pumper holley. They all need a rebuild so its a choice of which one, i plan on adding jet extentions to it for up hill climbs any other tricks as well??? The throttle body injection is giving problems that i cant seem to straighten out.

 

[StevoandaRedK5]

I would use one of the single 600 holley's, the others would probably be too big for stock and just harm fuel economy unnecessarily.

 

[nvrenuf]

Fix the tbi.

 

[Thunder]

If i had TBI i sure wouldn't swap to a Holley. Even with the offroad mods it wont work half as well as TBI in the rough stuff.
That being said. If you are determined to use a holley. Use the 600 CFM single pumper. That is plenty of carb for your engine.
here is a good page that tells how to mod one so they will work acceptable offroadhttp://classicbroncos.com/carb_tricks.shtml

Why dont you post up your TBI problems over in the "Injection section"
We will do what we can to help you out.

 

[jt512]

choice # 1- try to fix the TBI even if it costs as much as a brand new carb you would be better off with FI then carbed. If there is no realistic way to fix it - 600 single pump , the others would be to much carb for the cubic inch and rpm range you will be in.

 

[Supreme70]

Sounds like Im going to go try and fiz tbi, thanks guys