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Correct jet size on Holley
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sam57 View Drop Down
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    Posted: August-16-2013 at 6:41pm
My 77 Southwind with a 351 PCM with 4 barrel Holley is running too rich and fouling new plugs with black soot after 2 hours of putting around and bar hopping. I'm getting the carb rebuilt and want to make sure it has the correct size jets. Most of my running is putting around at 1000 RPM, what would be the correct jet size?

Thanks,

Sam
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Bri892001 View Drop Down
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2013 at 7:19pm
If you get your list number of your choke horn, you can call Holley Tech support, and they should be able to tell you.

Did this start all of a sudden?

Thinking your richness could also be a ruptured power valve or a good old fashioned float/needle/seat issue.
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Gary S View Drop Down
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Points: 14096 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2013 at 11:39pm
+1 and they can tell you what jets are supposed to be in there maybe someone changed them at one time
69 Mustang HM SS
95 Nautique Super Sport
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ultrahots View Drop Down
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Points: 618 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ultrahots Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2013 at 11:43pm
Put up the number as I have a TON of Holley parts guides here.
1980 Show Nautique
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boardersdad View Drop Down
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Originally posted by Bri892001 Bri892001 wrote:

Did this start all of a sudden?


You mean the putting around and bar hopping?   
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sam57 View Drop Down
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Points: 360 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sam57 Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2013 at 2:58am
When I bought this Southwind it came with an automotive Holley and ran good, but I won't use a non-marine carb on a boat. I had a marine Holley that came off a Shamrock I used to own that did the same thing plus blew black smoke out the exhaust. I replaced the Shamrock carb with a Edlebrock, put a new power valve on the Holley, and put it on the shelf knowing some day I might need it.
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E4ODnut View Drop Down
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Points: 66 		Post Options Post Options   Thanks (0) Thanks(0)   Quote E4ODnut Quote  Post ReplyReply Direct Link To This Post Posted: August-29-2013 at 1:50am
My copy of the Holley performance catalogue shows the 4160 vacuum secondary #R80319-1 for the 351 Windsor has having a 122-65 primary main jet, a 125-25 power valve, 1-1/4"diameter primary venturi, 1-5/16" diameter secondary venturi, and 1-9/16" throttle bores.

From my experience, even with factory specs and tuned as good as I can tune, they tend to run rich from off idle to about 2800 RPM. Then they seem pretty good until the power valve opens up when they get overly rich again. This is not a major problem, just hard on fuel.

If you are fouling plugs then I suspect s carb tune up is in order.
Robert
1993 Bayliner 3288 "Hocus Pocus"
351 Fords, converted to tuned port programmable EFI
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Randy_in_Ohio View Drop Down
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Points: 1891 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Randy_in_Ohio Quote  Post ReplyReply Direct Link To This Post Posted: August-29-2013 at 5:35pm
Hey Sam! sorry for the thread jack... How you been?

I may have to take a ride out to Portage lakes and do some of that puttin around and bar hopping with ya sometime!
1993 Sport Nautique
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AndrewB View Drop Down
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Points: 35 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewB Quote  Post ReplyReply Direct Link To This Post Posted: September-15-2013 at 1:57am
Originally posted by Randy_in_Ohio Randy_in_Ohio wrote:

Hey Sam! sorry for the thread jack... How you been?

I may have to take a ride out to Portage lakes and do some of that puttin around and bar hopping with ya sometime!


I apologize for the same thing but randy have I seen your boat at Berlin?
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