[Michael C Henry]

I have two 600 cfm 1850 holleys .I was not happy with the rate that the spark plugs went black and started fouling. I had a local tune up shop hook it up and run it on a dyno too see if it was a ignition or fueling problem. The holleys have had the choke towers removed and were heavily romanced by Quick Fuel Technology.They came back with #73 jets . I reduced jet sizes to #66 primaries and #68 secondaries and 2.5 power valves to be sure they were closed. Testing said the engine was above 8% fuel in midrange. They said that I had enough vacume to use 6.5 powervalves. but jet size needed to be cut enough that I should start with #60 jets.They said that I was way over fueling. I'd like to get these carbs right before I switch to new 1850s with a choke for the cooler weather.