Thumbnail Filmstrip of Hilborn #54 Rotator Spool- Barrel Valve works in Images
Barrel (Metering) Valve Rotator Spool for use with a secondary valve. 54 spool
This is the most popular of all spools for street, race, engines, unblown on gas, E-85 , Alcohol, up to 575 cu in
......573” Dia 1.762” long dimensions
For huge unblown engines , use a #56 spool
Factory Hilborn rotator spool-
his fits all Hilborn barrel (metering) valves
These rotors are for the standard Hilborn metering valve. O-ring included. Choose from:
A - #57 Small motor on GAS 40-200 cu in or methanol for 1 cyl engines .090"
B - #54 Medium to large motor GAS or ALCOHOL slot .186"
C - #56 or a 61 Medium to large motor, Small percentages of NITRO. Slot width: .308"
A = .100"
B = .187"
C = .312"