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Author Topic: carb size  (Read 474 times)

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fryedaddy

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carb size
« on: August 28, 2024, 12:41:16 PM »
i have a holley carb i picked up and its supposed to be a 850 but the list #4779-2 says 750dp. is it for sure a 750 since it says this on the choke horn?
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1966 comet caliente 428 4 speed owned since 1983                                                 1973 f250 ranger xlt 360 4 speed papaw bought new

GerryP

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Re: carb size
« Reply #1 on: August 28, 2024, 12:47:12 PM »
It is a very common 750CFM double pumper.
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frnkeore

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Re: carb size
« Reply #2 on: August 28, 2024, 01:03:06 PM »
For there to be any hope for a carb to be a 850, it has to have 1.75 throttle bores.

The 750/780's have 1.688 bores.
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Frank

Rory428

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Re: carb size
« Reply #3 on: August 28, 2024, 03:11:17 PM »
The regular 850 Double Pumpers are List 4781, as mentioned, List 4779 is a 750 DP.
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1978 Fairmont,FE 427 with 428 crank, 4 speed Jerico best of 9.972@132.54MPH 1.29 60 foot
1985 Mustang HB 331 SB Ford, 4 speed Jerico, best of 10.29@128 MPH 1.40 60 foot.
1974 F350 race car hauler 390 NP435 4 speed
1959 Ford Meteor 2 dr sedan. 428 Cobra Jet, 4 speed Toploader. 12.54@ 108 MPH
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