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What we can do for you

Conversion StatsPersonalized custom tuned Carburetors please read this Tune Info worksheet
May not be legal for sale or use in California or on many pollution-controlled vehiclesWe convert Holley HP 4150 carbs to use E85 fuel. We can convert other carbs. Please contact us for a quote.
The conversion process will change your idle restricters, jets, power valves, fuel metering blocks and sometimes boosters. On engines producing 700+ HP with a 4150 style carb we recomend .180" boosters.
We set your carb up for E85, but you will need to do the final tuning.
Your carb can be set back to gas with jets, power valves, and idle restricters; the extra metering block flow is also backward-compatible.To do a conversion, please:
Select Conversion and pay through paypal.
Print out your payment confirmation, and pack it along with your name, address, phone number, and your carb.You may also pay with a Cashier's check or US Postal Service money order--add $45 for return shipping--made out to Rob Mix Services,
and send along with your name, address, phone number, and your carb.
Send it to:
Rob Mix Services
465 North Street
Saint Paul, MN 55130We try to turn around your conversion fast--about 5 business days in shop. For return shipping we use UPS Ground. Faster service is available for additional fee.