I keep getting questions who did the modifying I have no idea! All i can say they are not heavily modified can go back to gas just by changing the
1 discharge nozzles
2 jet change
3 the secondaries are metering blocks with holley jets.
4 primary metering blocks where only drilled out on the idle circuit slightly could still run on gas just could be rich on idle.
I hope this helps! Above Added: Sun November 20, 2016, 12:41 pm EST
I dont know to much about theses carbs other than they have been modified to run E85 I have only started my motor and only idled with revs. they respond very crisp. Above Added: Sun November 20, 2016, 9:16 am EST
I was building my truck for the track only so i had no problem with running 660's carbs. Now it is a street/strip truck and I need more friendly street carbs or carb
1-1050-1250 dominator Above Added: Sat November 19, 2016, 2:15 pm EST