I have a 650 and 750 demon I run on my car.
All the info used to be on the demon website but since holley took them over it is gone.
I have drilled and tapped the emulsion, IFR, PVCR for 6/32 x 1/8 brass set screws and tuned both of my carbs.
The 650 and 750 metering blocks are the same and have 3 .031 drilled holes for each tube.
IFR is .031
PVCR .059
Demons I have run rich on the idle circuit (idle - approx 2500 rpm) After 2500 the Primary Jet comes in. I always go smaller on the IFR to lean the idle circuit, smaller PMJ to lean highway cruise, and bigger on the PVCR to richen WOT when the PV is open up front.
