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3/8"-16 and 5/16"-18 threads
you will need the PN MSD8920 Tach Adapter
reducing the likelihood of detonation and engine knock
Note: Not compatible for power steering and automatic transmission line applications
Profiled clearance for stroker applications
6MM 1/4 WATER PUMP SPACER SUIT GILMER SETUPS Category_FILTER CLEANING 3/8"-16 and 5/16"-18 threadsGilmer Pulley Spacer 1 4" (6mm) Thick with 5 8" Centre Hole Fits Chev, Ford & Holden. Required for Red Style Pump on Holden V8 Water Pump Gilmer Pulley Spacer. Universal shim for water pump pulley, 6mm (1 4") thick. 15. 8mm (5 8") centre hole. Suits Chev, Ford & Holden. Required for Red stylepump on Holden V8. Part Number AF64 3005