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Old 09-21-2005, 08:21 PM
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Holley Carb

4777-7 is stamped on this carb. i was told it is a 750 cfm, but is it really a 650? Is this too small or too big for my 350. .030 over 2.02 heads, 1 5/8 headers, blah blah blah. It's a 4150 series, double pump forsure! My problem is I have a popping sound in the exhaust and a hesitation/power loss when i accel. or cruise (5th gear 1800rpm) Or, cruise in any other gear. I want to know if I should install larger primary and or secondary jets.

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Old 09-21-2005, 08:45 PM
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You got a leaky spark tube...
 
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4779 is a 750, 4777 is a 650
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Old 09-21-2005, 09:48 PM
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well seeing as someone brough it up

where are these stamps located on the carb? I have a holley that been sitting in my garage for a while and i dont know what it is either...all i could find was 8101
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Old 09-21-2005, 09:51 PM
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I had the same problem, my advice, take it to someone who knows what their doing with carberators, sure you can mess with them, but getting them to run right is tricky, when it was all said and done, i needed a diff power valve, different jets, diff secondary springs, all new gaskets, work done to the secodary diaphram and messing around with pump cams and accelerator pumps, which by the way is why your having a hesitation from idle 99 percent of the time hestitaion or "stumble" from idle is due to an improperly adjusted accelerator pump or the wrong pump cam.
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Old 09-21-2005, 10:05 PM
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if you guys go to holley.com,there's enough info there to keep you going full time for a mth.they'll explain all of it.as for the popping in the exh.,probably nothing to do with the carb but rather a valve or bent push rod or half broken timing chain or needs a timing chain and gears.look at the valve train.good luck.
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Old 09-21-2005, 10:24 PM
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You got a leaky spark tube...
 
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The stamp is located on the front of the choke horn. The number will be something like 3310-2 or 4779-4 or whatever it may be. You can take those numbers and look them up on www.mortec.com to find out what size it is and any related info.
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Old 09-22-2005, 06:34 AM
Technical Support Barry Grant
 
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Popping out the exhaust.

Generally a pop out of the exhaust (or an afterfire) is caused by being too rich! This is usually unburned fuel burning in the exhaust system. This can be due to the carburetor tuning (jetting too much, float levels too high, butterflies adjusted improperly, etc.) or the timing being too retarded.
When does it pop out of the exhaust? Have you checked your plugs yet? Has this combination always done this, or did it just start happening?
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Old 09-22-2005, 04:14 PM
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first off, thanks to everyone for your imput/feedback. just to clairify, i can accel. gently or hard up to about 2000 2300rpm without any problem. at this point, it begins to pop. it will do so untill i mash the pedal, and the secondaries kick in. a few seconds later it will continue to pop untill i back off the throttle, change gear ect. the plugs look great. i tuned this carb{idle circuit} myself, but haven't really gotten in to it just yet. the engine has about 2000 2500mi on it. just rebuilt by a reputeable shop in my area that specializes in classic mopars. but they don't have anyone w/any knoledge of carbs. finally the valvetrain looks great. oh yes, this carb is "new" to me. the one they took off is a holley, PN 0555 on the choke horn,R84010-2 above that. and 12R-C554B below the front sight plug. they said "the passenger side bank was getting too hot, and that this is a marine carb and shouldn't be put in a car" i paid $200 for the "750" {they said} and after a short 3 week break, in i could "beat on it all day, n not hurt anything" i've had no luck with it since then i think i'm going to re-install the old one on sat. if you have any info on this carb, pls let me know. thanks
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