Holley 4150 transfer slot leak - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-29-2009, 07:59 PM
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Holley 4150 transfer slot leak

Trying to diagnose a leak in one of the secondary bores of a 4150 with vacuum secondaries... while idling, a steady drip can be seen from the transfer slot onto the throttle plate, occurring about every 10 seconds... same drip continues after shut-off, causing a flooding condition which makes it hard to start the vehicle... this is on a 327 AMC.

This is the only one of the four throttle bores that has the problem... pulled the sight plug on the secondary bowl and float level seems ok, no overflowing... carb had been rebuilt and did not have the issue before vehicle was stored for about a year.... Hoping someone can provide some advice on how to fix, would like to avoid a complete rebuild if possible... thanks for any help.

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Old 12-30-2009, 12:01 AM
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The booster may be loose and leaking down the side of the venturi and appearing to be the transfer slot.

Gently see is the boosters wiggle.
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Old 12-30-2009, 02:48 AM
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Welcome to the site! A complete rebuild doesn't cost that much as far as part's untill you have to take it to a shop to get it done. My kit only cost 26 bucks for my 1850-2. WOW, 327 AMC? been a long time since I heard about one of those. The first time I ran into one of those was back in 72 and it was in an older rambler american. That motor ran so smooth, you could put your hand on the fender and not even feel it running.
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Old 12-30-2009, 05:47 AM
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Quote:
Originally Posted by sqzbox
WOW, 327 AMC? been a long time since I heard about one of those. The first time I ran into one of those was back in 72 and it was in an older rambler american.
Had one in town in a new '65 Marlin, IIRC. Damn that car was funky. I remember being kinda miffed that Rambler had a 327- that was a CHEVY engine! I was 11, what do you want? lol
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Old 12-30-2009, 06:37 AM
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Like chevy's 302 and ford's? Ever notice how close engines are in size by different manufacturer's? Pontiac even called their 354 a 350 just to keep in line with the others! I have to admit, this is the first time I've heard about a holley on a 327 AMC. Makes you wonder how it's still running on unleaded gas.
My 70 engine (360) was just like chry. and came with 280 hp advertised and had an autolite 4 bbl carb. That was the first thing I tossed in the trash even while it was still under warranty. My 71 Javelin had so many ford part's on it, it disgusted me! The worst was the steering. Even though it handled great, the part's wore out fast and was constantly replacing ball joints, tie-rods, and control arm bushings.

Last edited by sqzbox; 12-30-2009 at 06:45 AM.
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Old 12-30-2009, 10:10 AM
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If the air bleeds are plugged the fuel will continue to siphon from the metering well . Blow out the air bleeds with compressed air. Keep your face back when you do this.
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