Big Block and Small Block Chevy Stainless Steel Mercruiser Thermostat Housing Replaces Mercury 860256A4 holdenv6conversion Crafted from hollow cast 316

Crafted from hollow cast 316 grade stainless steel

20mm (3/4") female ports

- Illuminate your space with style and ease

The lightweight aluminum manifolds accept Holley square bore carburetors and include an externally plumbed hot water crossover passage

Tests quality of fuel by measuring alcohol content

Big Block and Small Block Chevy Stainless Steel Mercruiser Thermostat Housing Replaces Mercury 860256A4 holdenv6conversion Crafted from hollow cast 316Stainless Steel Thermostat HousingBig Block & Small Block Chevy with Circulating Pump Low Profile & EFI These beautiful cast stainless steel thermostat housings are designed to replace that ugly black factory cast iron unit that is original equipment on most Mercruiser applications. Its gleaming polished finish adds sparkle to any engine. Designed to work in conjunction with the factory circulating pump and available in both standard height and low