Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 ronstan ball bearing orbit blocks - series 30 - single becket swivel self-lubricating nylatron sheave Designed to accommodate a 60mm

Designed to accommodate a 60mm (2 3/8”) post diameter

No stress relief when machining

398-8778A29

Aluminized surface reflects 2000 degrees F Multitude of uses around race cars

this exquisite nautical instrument boasts a sophisticated design with Roman numerals

Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 ronstan ball bearing orbit blocks - series 30 - single becket swivel self-lubricating nylatron sheave Designed to accommodate a 60mmFor use in Big Block and Small Block Chevy Mercruiser Applications Constructed of Cast Stainless Steel. Replaces factory black cast iron MerCruiser housing. Designed to work in conjunction with the factory circulating pump. Can be used in low profile applications such as EFI engines etc. Thermosat NOT Included. Works with Mercruiser 860256A4 MCM & MIE V6 V8 (305 & 350cid) w Bravo Drive Replaces Sierra 18 1989 and 18 3530 1