if you do the numbers, a none boosted 225 at sea level with 100% efficiency (reality, the max would be 85%) would have a max CFM of 326 at 5000 rpm. as you increase altitude, it drops. so at 500 feet and at 85% its only 277 CFM so with this you can decide how much carb you need...just thought i would pass this on GRT ps thats why webers are so good for these engines..I used to sell and install webers and they perform very close to the same as a throttle body...pss a 38 dgv weber is 390cfm approximate

What Weber carb will fit the /6 two barrel intake, and what were they used on?

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70 Valiant Super Six

None. All will require an adapter.


The Holley 5200 flows 280 CFM.

I was very happy with the 38-38 weber , but the linkages was no fun

99004.551 weber adapter kit....most are $35 to $45 depending on where you get it GRT

These are the ones I know about.
I tracked my 5210 down to coming off of a 1977 Vega. I found this info out of a Chilton Auto Repair Manual 1975 through 1982.

The 5200 is considerd a Ford Autolite Motorcraft Carb.(at least in this manual). From 1975-1981.

The 5210 is considerd a Holley as is the rest of the numbers below.

The 5210 included AMC 1977-1979.
GMC Chevette 1979 and 1980, Monza & Vega 1975-1978, Starfire 1976-1978, Astre, Sunbird and Ventura 1975-1978.

Numbers below are more electronic.
The 5220 is a 1978-1981 Chrysler Omni/Horizon version.

The 6500 is a 1978-1981 Ford Pinto/Bobcat.

The 6510 is a 1978-1981 GMC.

The 6145 and 6520 is a 1981 Chrysler.

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82 D150 Slant6 Shorty
http://www.cardomain.com/ride/658846

My '84 Dodge Shelby Charger came with a Holley 6510 carburetor.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

5220 and 6520 (O2 feedback) and both vacuum secondary found on caravans up to mid 1987.

Cheers, Wizard

How much does a BBD flow?

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

I have seen them listed as 280 or so cfm...

Yeah. A BBD is rated at 280 CFM, except the BBDs that were installed on 383 motors.

Don't forget that 1 BBL & 2 BBL carbs use the 3.0 inHg method to rate air flow CFM and 4 BBL carbs use the 1.5 inHg method........

Here's the formula

(4bbl rating) = ((2bbl rating)/1.414)
(2bbl rating) = ((4bbl rating)*1.414)

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes