Holley/Weber 32/36 - 5200/6500 Series

Airflow, CFM

5200 series carbs are mostly fitted with 26mm primary and 27 mm secondary venturis, giving 270 CFM @ 3 inches mercury (note that this is equivalent to a 4-barrel type rating of 193 CFM -- 4-barrel carbs are rated at 1.5 inch mercury).

* 270 CFM: 26/27 venturis (193 CFM equivalent to 4-bbl style rating)
* 235 CFM: 23/27 (some, starting in 1978)
* 245 CFM: 23/29 (1979 up Chevette)

The 245 CFM model sounds like a good candidate for a 1200cc engine as compared to the stock Hitachi carb's 20/26 venturis.

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Holley 6500

The Holley 6200/6500 is a feedback version of the 5200 carburetor, an electronically controlled jet system. Early models used a vacuum switch while newer models used an O2 sensor (Lambda sensor).

Holley previously sold an electronic "dial a jet" package that would plug into the 6500, bypassing the oxygen sensor and letting you control the amount of fuel through a dial on the dashboard. This was the "Holley Electronic Carburetor" system with a 11-position controller module, that varied mixture about 12 jet sizes just by turning the dial. A "computer" was optional and monitored fuel economy and other factors.

reference: Aaron

The 6500 used a modified power valve assembly. Instead of a simple open/closed valve, this is a metred valve. It is controlled by a needle raised/lowered by a solenoid on the carb.

Components needed are:

Carb
Lambda (Oxygen) sensor (for 6510/6520 models)
Control box
Solenoid and Vacuum Control Valve
Wiring

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Holley 5200 U.S. Applications

Ford – Pinto, Mustang II and Capri 4cy. &V-6
Chevy – 5210 introduced in the ‘73 L-11 perf. version of 2.3L Vega
Pontiac – 5210 introduced in ’77 on the new 2.5L ‘Iron Duke’ engine
AMC – 5210 on the Audi powered ’77 Gremlin
Chrysler – 5220 introduced on the ’78 1.7 VW/Audi Dodge Omni & Plymouth Horizon

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The 65xx Electronic Feedback model (with O2-sensor) was used on:

6510: 1980 Chevette, California market
6510: 1981 Chevette, Federal + California markets

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5200 was used on:
* All Ford 2.3 liter carbureted engines
* USA models with 2.8 V6 carbureted engines
* Ford Pinto/Mercury Bobcat 2.0 and 2.3
* Mercury Capri German-made Capri circa 1974
* Mustang II (1974-1978)
* Fox-body Fords (1978-1986):
** Mustang/Capri, Fairmont/Zephyr, LTD/Marquis, Granada, Thunderbird
* 1979-1982 Ford Courier pickup 2-liter engine (Isuzu truck)

The Holley 5210 variation was designed for the Chevrolet Vega 2.3 liter engine and first used in 1973. The main difference is a built-in GM-style fuel filter in the top casting.

5210 was used on
* 1973-1977 Chevrolet Vega
* 1977 Pontiac Astre
* Pontiac "Iron Duke"
* Chevette
* 2-liter Audi engine (Porsche 924 engine) in the AMC Gremlin

5220 variation of 5210 was used on:
* Dodge Omni and its twin Plymouth Horizon 1.7 liter Volkswagen engine in the
* Chrysler 1.7, 1.6 & 2.2 engines

* 270 CFM: 26/27 venturis (193 CFM equivalent to 4-bbl style rating)
* 235 CFM: 23/27 (some, starting in 1978)
* 245 CFM: 23/29 (1979 up Chevette)

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