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Hi guys anyone tell me someinfo on the Holley carb doublepumper not sure what size it is and if its ok to put on my 350 Chev its a 4777-2
are these good carbys,,,,
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I believe a 4777-2 Holley is a 650 DP.
Not a bad carby, but what's wrong with a Quadrajet.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
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Rank: Member
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Hi Dr Terry yes i thought that was the case thanks, the Quadrajet is a great carby which i dont have so i will have to make do what i have.
Cheers
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hi simonbee .. i guess it depends on your application but you might find with the Holley 650 that your engine may be a little under carburetted and possibly not happy without a bootful on the throttle most of the time...
...went down this road as a young bloke with my own GTS350 and quickly changed back to the 780 CFM that was on the car when i bought it...
...the Quadrajet was rated at about 750 CFM for the 350's and are still a very good carby to consider....cheers mate
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But a quadrajet airvalve that dampens then sudden opening of the secondaries where as a double pumper doesnt, thus when selecting a carb for any given engine a double pumper should be smaller than an airvalve or vacume secondary equipped carb.
Is the manifold drilled for squarebore, spreadbore or both.
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...thats pretty much the guts of it Simmo .. the Holley 780 on my own car is a single pump, vacuum secondary...set up for the TH 400 and was/is a good and proper fit, whereby the double pump mechanical secondaries were always a better fit for a big cube HP manual...
...pretty sure this arrangement on mine is set upon a spread bore inlet manifold...(factory HQ GTS350)
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