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Factory Hilborn rotator spool replacement
This fits all Hilborn barrel (metering) valves where a 23-54-57-77- fits
For blown engines or very large cubic inch engines.
Blown from 400-600 cu. in.
Unblown from 600-750 cu. in. using some % of nitro
It has a .312" wide ramp
These rotors are for the standard Hilborn metering valve. O-ring included. Choose from:
A - #57 Small motor on GAS 40-100 cu in or methanol for 1 cyl engines
B - #54 Medium to large motor GAS or ALCOHOL
C - #58 ( #61) Medium to large motor, moderate to high percentages of NITRO. Slot width:
A = .100"
B = .187"
C = .312"