Holden 6 owners yes these will fit your 186 and 202 engines in your Kingswood, Monaro, Torana early Holdens with side exit top radiator hoses. They will bolt to red motor, blue motor and black motor cylinder heads that are not using the factory water hoses for manifold heating or need to run water outlets without adding extra fittings.
You are buying a sand cast yes they are hand made/molded cast aluminium upper and lower thermo housing and base including zinc plated bolts and washers, upper and lower gasket in a shot blasted aluminium finish. The base is thicker so no need for a thermostat housing spacer when running an Aussiespeed rocker cover.
Gasket surfaces are machined not run over a linishing belt.
These are cast from premium quality aluminium and surfaces are machined flat for positive sealing.
Accessories like heater fittings, temperature sensors can be drilled and tapped in the housing if required.
These are supplied in a raw blasted finish, you can paint, polish, powder coat to match your engine and engine bay.