Billet Performance Products Head Rear Coolant Fitting Nissan SR20

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Billet Performance Products rear head coolant fitting gives Nissan SR20 engines a clean way to take water from the back of the cylinder head and improve coolant flow across the eng ine. It is commonly fitted on higher-output SR20 builds where rear cylinder head temperature control matters more than it does on a mild street setup. Instead of drilling the head, this fitting uses the existing thread once the welsh plug is removed, making it a practical workshop upgrade during an engine-out build, head service or cooling system redesign. The product is available in the AN fitting options listed on this page, making it easier to match the rest of your braided hose and cooling system layout. FEATURES MPN: BPP2001 Engine fitment: Nissan SR20 including S13, S14, S15 and VVL heads Function: Adds rear cylinder head coolant outlet to improve water flow Installation: No drilling required; remove welsh plug and bolt into the existing thread Available options: -10AN and -12AN Use case: Suits custom cooling system layouts with braided hose TYPICAL APPLICATIONS SR20DET cooling system upgrades Street, drift and circuit builds with sustained heat load Engine bays using remote thermostat or custom coolant plumbing Workshop engine builds where head temperature balance is a priority FITMENT NOTES Designed for Nissan SR20 heads including S13, S14, S15 and VVL Select the AN size that matches the rest of your coolant hose and fitting package Best installed while access to the rear of the head is available Always plan hose routing, firewall clearance and the overall cooling system strategy before installation Show more