Trundles Cylinder Head Coolant Bypass for Nissan Patrol TD42 Aftermarket NON Genuine Head

Cylinder Head Coolant Bypass to suit Nissan TD42 Engines Includes:1x Cylinder Head Coolant Bypass for Genuine TD42 Head Details- Designed to help reduce the micro boiling points in the TD42 Pre Combustion chamber areas in head- The genuine head fitting suits OEM heads with 34.9mm frost plug- The aftermarket head fitting suits heads with 36mm frost plug Note: You will need to tap a M6 hole in the back of your head and a 1/4" NPT in your thermostat housing.