CFM rating and carb question.

[green68250]

Is there anyway to tell what the CFm rating is on my stock 2100-A on my 390 in my '68 F-250? Also is the Holley 500 CFM 2bbl worth the $275? I put the reman 2100-A on the truck a year or so ago and have never been that happy with its performance. It has a small dead spot off idle and i have tried everything to get rid of it but nothing seems to help. I'm wondering if its time to try a better carb. Any thoughts?

Corbin

[Dragon]

The code number stamped into the left front mounting flange will tell you what you really need. Like is it the original style?

A 360/390 in the later years all got the same carb. They had 350 cfm.

And no a Holley 500 cfm 2v is not worth it.

A 600 cfm 4v has smaller primaries which help mileage and the same size secondaries to help horsepower.

http://www.ponycarburetors.com/ Go here and learn what the 2V autolite and 4V Autolites can really be like.

[sideoilerfe]

And no a Holley 500 cfm 2v is not worth it.

I had one on my truck and it ran great.

[FORD428CJ]

If it was me........I would go to a 4bbl carb and intake. Little better milage and performance to boot. But thats just me! LOL JMHO Good Luck no matter what you do.

[Dragon]

And no a Holley 500 cfm 2v is not worth it.

I had one on my truck and it ran great.

They do run great but they are overpriced for their size. For 275 you can get a 600 4V for less new. Big barrels like one half of a Dominator. But running great and economy do not go hand in hand.

[green68250]

Yeah I have been tossing around the idea of going to 4v but right now i dont know if I want to afford a new intake and a carb. I'm not really concerned with mileage, I have my 300 for that. I want a little better performance for not too much money. I can always go to 4v later and use the carb on another project or something. As long as no one has had any problems with the 500 CFM holley than I still may go that route. Any other suggestions?

Thanks again for the help,

Corbin

[Dragon]

You can have my 1965 C5AE 4V intake next week for 20 bucks plus shipping. 93 pounds. but I got a box it will fit in. The 20 is for boxing and cleaning the manifold is free.