Nissan Patrol TB42 4.2L Petrol Cylinder Heads & Engine Parts

Looking for a premium aftermarket replacement Nissan TB42 4.2L petrol cylinder head? We supply brand-new complete heads, gasket sets, and internal engine components from premium Australian stock with rapid nationwide delivery.

The big-block Nissan TB42 4.2L inline-six engine (GQ Patrol) is a legendary, bulletproof power plant, but heavy off-roading, towing, or high-temperature dual-fuel LPG setups can eventually cause head warpage or casting cracks. Common symptoms of a failed TB42 head include oil mixing with the coolant (milky residue under the filler cap), persistent white smoke from the tailpipe, or constant bubbling in the radiator.

Why Choose Midland Cylinder Heads?

• Australian-Assembled Quality: Our licensed technicians build and inspect every brand-new cylinder head to strict OEM specifications, with all valve depths pre-set during assembly.
• Premium Composite Gaskets: Our replacement kits feature high-grade composite head gaskets engineered to handle intense thermal expansion, fill minor block imperfections, and provide an enduring compression seal.
• Included Torque Specs: Every order includes the correct tightening sequence and torque specifications to ensure a perfect installation.
• 12-Month Warranty: Drive with peace of mind with our 12-month, unlimited-kilometre warranty on all parts.
• Fast Dispatch & No Core Exchange: Units are sold completely outright (no need to send your old head back) with fast dispatch from our Perth and Melbourne hubs.

Our Parts Summary

• Brand-New Assembled Cylinder Head: Premium replacement unit with brand-new valves and valve springs, professionally fitted and vacuum-tested.
• Premium Head Gasket Set with Bolts: A comprehensive premium composite head gasket set with all required intake, exhaust, and valve stem seals, plus fresh Torque-to-Yield (TTY) stretch bolts.

If you need technical help or want to check stock on TB42 4.2L components, call John directly on 0406 611 288. Please note we are parts specialists only—we do not provide mechanical vehicle fitting.

Browse TB42 4.2L Parts

Nissan Patrol 4.2 Ltr Petrol Engine
We can machine the head face in our workshop. From $196.00
Recondition your cylinder head. If your cylinder head has failed, bring it to us, and we will inspect it and provide a repair quote. From $495.00
New Bare cylinder head. $990.00 Order online or by phone. Fast dispatch from Melbourne.
New 4.2 Ltr Petrol Cylinder head. This head is fitted with valves and springs. $1245.00 Order online or by phone. Fast dispatch from Melbourne.
Quality Aftermarket New TB42 4.2L assembled cylinder head with valves, springs, head gasket set, and head bolts. $1490.00 Order online or by phone. Fast dispatch from Melbourne.
TB42 4.2L Vrs Head Gasket Set, including the head bolts $246.00 Order online or by phone. Fast dispatch from Melbourne.