Ronstan Series 75 Core Block - Single, Universal Head mastercraft as used on most American

as used on most American boats

All pulleys 5/8" dia Shaft Size

16mm spline shaft

These manifolds will fit Chevy 283

so trust the most reliable components available

Ronstan Series 75 Core Block - Single, Universal Head mastercraft as used on most AmericanCore Blocks are a true all round solution. A tuned 2 stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for