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Thumbnail Filmstrip of Hilborn #77 Rotator Spool- Small Engines- Turbo, a Images
Barrel (Metering) Valve Rotator Spool #77
Used on Race Saver Sprints to help off corners - 305 Race Saver
.573” Dia 1.762” long shaft .309”
Factory Hilborn rotator spool
This fits all Hilborn barrel (metering) valves
#77 spool- Small idle ramp
Works well for turbo charged engines and small engines 150-350 cu. in.
.186 " wide ramp
Allows for lean idle and then comes on quickly about 2500 RPM.