I am looking to replace the old rottenchester on my inline 250ci, does anyone have any reccomendations on a carb and cfm. I am currently looking at a holley 350 or 500 cfm 2 barrel. Any help would be appreciated.
What carb you run will depend a lot on what you will be doing to the 250. If leaving it internally stock, probably no more than a Weber two barrel. Stovebolt even has an adapter for the stock intake. I am not familiar with the small Holley 2 barrel, but the 500, without mods to the engine may be too much. It is the carb the local circle track guys use on their race cars. With head work and a cam, small four barrels, like the 390 Holley or 500 Edelbrock work great.
When I get mine set up I will use the Holley 390cfm four barrel. I understand that with head, cam (or turbo) mods I can also modifiy that carb to comply nicely. Although I might change to a edelbrock if going turbo for another reason.
But I know everyone goes through this with their inline sixes. The onme barrels are a real waste of time. I have thought aboiut it and the best approach is the small four barrel. For the same price as any thing else you get the best of both worlds and it is pretty easy to set up. Yeah you have to buy a manifold, but you can get those for $200 or cheaper used.
Whats wrong with the stocker? If the rest of the motor is stock you won't see much of a gain with anything else. Don't blame the carb for every problem that could be carb related. The 6s are very famous for loosing the intake gaskets casing a lean surge problem that acts like a carb problem and the accelerator pump must be adjusted exactly right or it will run like crap.