So I'm using #59 (0.058 orifice) at the moment. To account for elevation here (around 6,000 feet above sea level), I went down three sizes as I was told one size for every 2,000 feet elevation. I can post pics if anyone wants to see them.Īssuming the engine is lean, what should I do with jet size? Stock jet size for this carburetor is a Holley #62, which corresponds to a 0.061" orifice. Pretty grey/white with hardly any combustion deposits very little carbon like I'm accustomed to seeing on a plug. Yesterday, I pulled the plugs and all look lean. I've put about 25k on the truck since that time. I rebuilt the Holley 4180C carburetor about a year and a half ago.
I own a 1985 Ford F-250 4x4 w/ 460 V8 and 4 speed trans.
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