Thermostat Housing Bolt Kit, Hex Head S/S AR434-7402 Product:fits GM LS Series 20mm UHL these heads are made from

these heads are made from a permanent mould casting that come with As-Cast surfaces on the intake runners

With many modern diesel engines having a EGR system where the combination of oil vapour and exhaust particles build up to the point of blocking the intake manifold and intake ports that is very common in direct injection engines

AF298-20DBL

830-16-12BLK

AF5079-1003

Thermostat Housing Bolt Kit, Hex Head S/S AR434-7402 Product:fits GM LS Series 20mm UHL these heads are made fromThermostat Housing Bolt Kit, Hex Head S Sfits GM LS Series 20mm UHL AR434 7402 434 7402 Nobody likes water leaks. And here's ARP's contribution to the solution. These premium grade bolts are engineered to properly engage the manifold threads and resist loosening. They're application specific, and come in your choice of black oxide finished chrome moly or rust proof stainless steel, with handy 12 point or standard hex heads. Washers included.