what cfm?

[vntned]

What is the stock cfm on the stock 6520 2bbl carb?

What size jets should i get with my setup and are they regular Holley jets?

My setup is an '84 GLH with the short deck shelby block, stock head milled .030'' (compression of about 10.2:1), MP 767 cam(.460'' lift .280'' duration) w/ the Shelby cam sprocket, Hedman hedder 2.75'' primaries 3'' collector w/ a 2.25 straight through exhaust.

I dont want to run lean or overly rich. I dont know all that much about carbs but Im learning. Help anybody?

(by ''anybody'' I really mean ALLMOTOR) : )

Thanks

VNTNed

[mopar missle]

280 cfm. that is from my holley book, so it should be correct. i know there is a jet kit for them but i don't know the part number. the chrysler fwd performance book lists the part# and some starting points for jet changes. i haven't had a chance to start messing with my omni carb yet. my experience with carb jetting is this; if youre at the track, make jet changes 2 sizes at atime so that there is a noticeable difference in e.t. then you can up or down one size to tweek it in. you should only go 6 sizes max one way or the other.if you need more than that , you need a different size carb.the other option is to buy an air/fuel ratio gauge set up from autometer. it's a great tool for tuning street cars without going to the track. hope thats helpfull. mm P.S. they are not standard holley jets.

[TurboTurismo]

Where you live, what year is the car? ..Is your car exempt from etest? If so try to nab a 5220 and ditch the O2 if you can..much better carburation..

[The Pope]

I've built a few NAs. I can tell you that no matter what you do no Holley runs like a Weber. Holleys don't run well on any Mopar lol. I posted a calculation on here a while back on how to find the CFM that you need. A good running street NA 2.2 needs a 350 CFM carb. But still, the last time I used a weber it was like a 40 HP shot of Nitrous. Sounds like I'm trying to make the Weber sound good by that, I may be insulting it actually, it is night and day better. Or get the dual carb MP intake and run 2 5220s.

[TurboTurismo]

Agreed.LOL

[Wizard]

Nothing else? Seriously that 5220 is choking that stock engine even 2.2?

Cheers, Wizard

[DaytonaTurbo87]

hmm, well I just ran 2.2L through a cfm calculator online, and assuming max revs of 6700, it says the 2.2 needs a 260cfm carb assuming 100% VE. That said, if the carb is designed properly, you can get away with a lot more cfm of a carb than you need, but that depends very much on the carb's design. At the bare minimum I suggest swapping away from the 02 controlled carb. Either that or stick with your current carb and save your pennies until you can afford a dual carb setup.

[vntned]

I think Im gonna stick with the stock carb for now to save money. I got the car for free so im trying to spend as little as possible so if I want to I can get my money back out of it. My last GLH ran lake a raped ape with the stock carb. Hopefully this one will too! : )