4180 Jetting?
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Tuned
Joined: Jun 2007
Posts: 317
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4180 Jetting?
I've got the front bowl off my 4180 to fix something else (took forever to pick off the felt gasket) and as long as I've got the bowl off I figure I'll take a look at the jetting. Only the jets aren't stamped with the typical Holley **H, they got some weird looking code. But anyway, in your opinion is the stock jetting in a 4180 adequate for a largely stock 78 460?
Post Fiend
Joined: Oct 2003
Posts: 9,176
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From: Western Central NV
From my experience 4180 that came on 460s with calif emmisions run .061 primary jet. but remember a stock 4180 has a two stage power valve. which requires less jetting. The thing you need to worry about with a 4180 is they didn't come with power valve blow out protection. Any back fire at all will blow it. 2 stage power valves are $30. blow out protection device is about $12. So if one hasn't been installed that is one thing you should do. Holley didn't start using blow out protection until 1992. 4180s were not build that late. A 4180 is smog carb that Ford used on the 460s, 351W, & in the Mustang's with 302 4bbls in the mid 80s up to 1986. 1987 came EFI in the Stangs.
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Tuned
Joined: Jun 2007
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It requires less jetting? I thought the idea of the two-stage was that it distributed the fuel burst rather than opening all at once. I'd think it would take more jetting. Incidently I took out the two-stage valve yesterday because I wanted to see what it would do with single-stage. I put in a 7.5 I had lying around. The carb is still in pieces so I haven't test anything yet.
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Tuned
Joined: Jun 2007
Posts: 317
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Okay now I get it. The two stage starts to open sooner so the initial effect is richer. So I may want to step up a bit. Although I'm at 3000 feet so the 61 jets may turn out to be just about right. I've got some 63s I could throw in it.
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