Proflow's RB billet aluminium thermostat housing is designed to to suit Nissan RB30 engines, replacing the top radiator hose outlet completely. It also features a -12AN ORB thread so you can run custom braided hose. Supplied with replacement gaskets and bolts.

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Proflow Cylinder Heads & Rocker Kit, SuperMax EFI Aluminium, Complete, 590 HP, 63cc Chamber, 200cc Intake Runner, EFI Holden Commodore VN, Pair

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