Keep your cylinder head torqued down with the APEX Automobile Parts Inc Engine Cylinder Head Bolt Set (AHB427). This head bolt set clamps the cylinder head to the engine block and holds the clamping load that keeps the head gasket sealed. It's a direct-fit replacement for a range of Ford, Mazda, and Merkur V6-2.9L and V6-4.0L applications, making it a natural companion whenever the head is off for a head-gasket job or top-end reseal.
- Job it does: secures the cylinder head to the block and maintains even clamping load across the head gasket.
- Engine coverage: fits the listed V6-2.9L and V6-4.0L engines.
- Quantity: one set per application, as specified in the catalog.
- Installation: torque in the correct sequence and to the values in the vehicle service information.
Fitment: 1986-1990 Ford Bronco II (V6-2.9L) · 1986-1992 Ford Ranger (V6-2.9L) · 1988-1989 Merkur Scorpio (V6-2.9L) · 1990-1997 Ford Aerostar (V6-4.0L) · 1990-2000 Ford Ranger (V6-4.0L) · 1991-2000 Ford Explorer (V6-4.0L) · 1991-1994 Mazda Navajo (V6-4.0L) · 1994-2000 Mazda B4000 (V6-4.0L).
Interchange: Manufacturer part number AHB427.
Frequently Asked Questions
What does this head bolt set do?
It clamps the cylinder head to the engine block and maintains the clamping load that keeps the head gasket sealed.
Which vehicles does the AHB427 set fit?
It's a direct-fit replacement for the listed Ford Bronco II, Ranger, Aerostar, Explorer, Mazda B4000 and Navajo, and Merkur Scorpio applications. Check the Buyer's Guide tab for your year and engine.
What engines is this set cataloged for?
The listed applications use the V6-2.9L and V6-4.0L engines. Confirm your engine against the Buyer's Guide before ordering.
Can I reuse my original head bolts instead?
Consult the vehicle service information for the correct fasteners and whether they may be reused, since many head bolts are single-use torque-to-yield designs.
How many sets do I need per engine?
The catalog lists one set per application, so each listed engine uses a single AHB427 set.
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