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Old 10-22-2011, 04:57 AM
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Holley 4777 Revisions

Hey guys,
Does anyone know the differences in these Holley revisions? I have a 4777 that I am rebuilding and have no idea which model I have. The choke tower has been milled off so I can not read it from there and only wrote down 4777 in a parts journel I keep. I want to build it to the most up to date revision I can, including jet and orfice sizes. Couldn't find much on the net other than the original had 2 power valves. Thanks for any and all help.

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Old 10-22-2011, 05:15 AM
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HOLLEY NUMERICAL LISTING HERE.
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Old 10-22-2011, 05:22 AM
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You may be able to tell from the metering blocks what "dash number" you have, although on my 4777-2 carb the blocks are not externally marked w/a p/n. There may be info on the web that will let you see what blocks you have by the PVCR and/or the IFR.

IIRC the 4777 carbs all had only a primary power valve, and the PDF would seem to confirm this- carbs on the list that have two PV's will use a footnote that denotes the secondary PV rating along w/possibly the primary PV rating. If you look down to the 4780/4780-1 carbs you will see what I'm referring to.

Good luck.
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Old 10-22-2011, 05:27 AM
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Thanks Cobalt, very helpful. As far as parts go all the 4777's look basically the same from that list, metering block wise anyway. I wish Holley put out a spec sheet with orfice sizes on it. Very curious why original had 71 main jets then moved to 67's on first revision.
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Old 10-22-2011, 05:51 AM
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Quote:
Originally Posted by GMCBEAST
Thanks Cobalt, very helpful. As far as parts go all the 4777's look basically the same from that list, metering block wise anyway. I wish Holley put out a spec sheet with orfice sizes on it. Very curious why original had 71 main jets then moved to 67's on first revision.
Possibly customer feedback that indicated it was pig-rich out of the box, especially if used on a dual plane intake?

Last edited by cobalt327; 10-22-2011 at 06:03 AM.
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Old 10-22-2011, 06:25 AM
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I have heard that the 4777's tend to run rich out of the box, is there any truth to that? I know carb's will act differently on different motors but there must be some guideline. Use to work at BG and know for a fact they sent those out on the rich side intentionally. Wonder if Holley does the same.
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