Join Date: Nov 2000
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Re: motorcraft 2100 jets
An old timer technique is to solder it up with silver solder then drill it out. The carb mfgr would cringe at this suggestion as I remember reading that drilled jets don't flow the same as they are not properly chamfered, etc and that you ought to buy jets. But on the other hand, if they are not available, what can you do? Try to find some spare jets to work with. Probably have to go to a machine shop supplier to get the fine increments of drill required. Can't see it being that critical the way it's drilled, as you are simply after results.
BTW, I am running 47's in my 1.08 MC2100 on my 258 and have decent looking plugs. I just changed the head as I suspect some oil was coming down the valve guides. I will take another reading in a week or so and see what the new plugs look like. A chassis dyno and co monitor would be great, but that's not realistic where I live. And what would we do with the results anyhow? If jets are not available. I'll have to see what holley jets look like and do a comparo with some MC jets to see what it would take to adapt.
84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster