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Q:I am currently running a 440 Rupp with 39.5 Mikunis. I am running 680 main jets, which are giving me almost perfect plug readings and ¼-inch of piston wash. Is there any way that I can get a jet made between a 680 and 660? I think that it would be way lean with a 660. Any opinions or suggestions? - Ruppsforever
A:If you are not concerned about the original look of the carbs then I would suggest a multi-adjustable clicker power jet. You can fine tune your main circuit to very small levels in between main sizes. The adjustable power jets are very easy to install and a very trick item for fine tuning mod sleds and performance stockers. - Dyna-Tek Racing