SKU: AD-58-SPOOL
HILBORN -KINSLER 58 Spool- Largest Spool for BLOWN ENGINES over 550 cu in

HILBORN TYPE  58 SPOOL   BLOWN GAS  BLOWN E 85  BLOWN ALKY  

This fits all Hilborn barrel (metering) valves  where a 23-54-57-77-  fits 

For blown engines .

Blown from 400-600 cu. in.
.
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   Unblown on GAS    slot A  
B - #54 Medium to large motor GAS or ALCOHOL Blown on GAS   Slot  B  
C - #58 ( #61)  Medium to large motor, Blown Alcohol   or between 5% & 30% Nitro  f NITRO. Slot width:  C  
A = .100"
B = .187"
C = .312"

56 NO LONGER AVAIL   USE A 61 TO TAKE IT S   PLACE