Thermostat Housing Bolt Kit 12pt Chevy V8 79-90

The Thermostat Housing Bolt Kit 12pt Chevy V8 79-90 is designed specifically for engine builders and serious mechanics working on first-generation small-block Chevrolet V8s from the 1979–1990 model years. This kit addresses common issues with factory stamped-steel bolts, which are often prone to corrosion, thread stripping, and inadequate clamping force, leading to potential overheating and coolant leaks.

Manufactured by ARP, this fastener upgrade replaces the weak factory bolts with high-quality 12-point bolts that offer superior tensile strength and corrosion resistance. The design ensures consistent load distribution across the housing-to-block interface, which is critical for maintaining a reliable seal, especially in high-performance applications. The pre-stretched design of these bolts eliminates preload relaxation, ensuring that the thermostat housing remains sealed through numerous heat cycles.

This kit is essential for both street and competition engines, whether you're performing a mild restoration, installing an aftermarket water pump, or building a modified small-block. Its compact size makes it easy to store in any toolbox, and the lightweight design reflects efficiency without compromising strength.