Holley #4781 - 850 cfm double pumper, 110 needle and seats installed, new rebuild  $350.00   Holley #4779 - 750 cfm double pumper, 110 needle and seats installed, 50cc primary/50cc secondary accelerator pumps, new rebuild  $300.00  Holley marine 750 cfm,  #80537 double pumper, dual feed, 4 corner idle screws, 110 needle and seats installed, like new, new rebuild, $400.00 these carbs have just been done this month they are fresh, the first 2 pics are the 750 marine carb. the other 2 are marked what they are.  Jim 1818-890-1867

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he's in Pacoima or real close to it, 5 and 118

Jim,

What carb do you suggest I go with for my application? This is going on a stock 454 in an open bow cruiser. Nothing fancy. I have a Demon 850 vac secondary that falls on its face because the secondary slams open. I've also been told that the 850 is too big for my application. I can switch to a 750 and get better gas mileage too. Let me know which one i should go with. Thanks!

Non related. How can you tell the difference between a 750 and a 850 if the choke horn is milled off. My buddy gave me a carb that he thought was a 850 but the metering blocks number run as a 750 part


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750 double pumper #4779 should have 1 3/8" venturi diameters and 1 11/16" throttle bores, while the 850 #4781 should be 1 9/16" V and 1 3/4" TB.

Thanks. I'll measure it when I get to the shop after work. Thanks.


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the throttle plates of 750 will have a 172 and 173 stamped on the bottom of them, 850 will have 180 stamped on the bottom of both plates

Thanks jim. Much appreciated


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Jim do you still have the 4781 and if so how much. Mark

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do you still have the 750 marine carb?also do you have paypal?

whats your opinion on closed hatch?what type of carb is best..i have a stock 454

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