Mahle 3978 Engine Cylinder Head Gasket

Mahle 3978 Cylinder Head Gasket

Mahle 3978 is an OEM-standard engine cylinder head gasket built with composite construction and graphite sealing material for dependable sealing performance. It is specified for a wide range of Ford, Lincoln, and Mercury applications, including Ford F-250, F-350, E-350 Econoline, and related V8 engine platforms.

MAHLE gaskets are used by OEMs and technicians worldwide for consistent sealing quality. This cylinder head gasket measures 0.04 in. thick (1.12 mm) with a 4.5 in. / 114.30 mm cylinder bore diameter, and it is supplied without gasket sealant.

Key Features

• Mahle 3978 engine cylinder head gasket
• Composite gasket construction with graphite sealing material
• OEM standard item grade for factory-style service replacement
• 0.04 in. thickness / 1.12 mm thickness
• 4.5 in. / 114.30 mm cylinder bore diameter
• Gasket sealant not included
• Fits Ford, Lincoln, and Mercury applications listed below

Detailed Description

Mahle 3978 is a graphite cylinder head gasket engineered for direct replacement use in compatible Ford truck and passenger vehicle applications. The composite design supports reliable head-to-block sealing in engines that require an OEM-standard gasket profile. For buyers searching for a Ford F-250 head gasket, Ford F-350 cylinder head gasket, or Mahle 3978 replacement gasket, this part matches the listed bore and thickness specifications for the covered applications.

This part cross-references FEL-PRO 8265 PT-1 and 8558 PT-1 for the same application. It also cross-references Rol HG32410.

What It Helps Address

• Coolant leakage at the cylinder head sealing surface
• Compression loss between the cylinder head and engine block
• Combustion gas seepage caused by a worn head gasket
• Oil and coolant mixing from a failed head-to-block seal
• Service replacement needs on Ford, Lincoln, and Mercury engines listed in fitment

Installation Notes and Tips

• Fits 1997 Ford F-250 HD, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1986-1997 Ford F-350, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1986-1996 Ford E-350 Econoline, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1986-1996 Ford E-350 Econoline Club Wagon, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1986-1996 Ford F-250, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1972-1978 Ford LTD, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1968-1978 Lincoln Continental, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1975-1978 Mercury Grand Marquis, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1972-1978 Mercury Marquis, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1972-1976 Ford Thunderbird, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1973-1976 Mercury Cougar, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1973-1976 Mercury Montego, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1972-1974 Mercury Colony Park, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite; without High Output Engine
• Fits 1968-1973 Ford LTD, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1968-1973 Ford Thunderbird, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1968-1973 Mercury Colony Park, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1968-1973 Mercury Marquis, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1970-1973 Mercury Montego, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1970-1971 Ford Mustang, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1970-1971 Mercury Cougar, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1969-1970 Mercury Marauder, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite
• Fits 1968 Lincoln Continental, N/A; Standard; Cylinder Head Bolt Replacement Recommended; Graphite

Before installation, verify engine code, bore size, and head surface condition. Cylinder head bolt replacement is recommended for the listed applications, and the sealing surfaces should be clean and flat before assembly. This Mahle 3978 gasket is a direct-fit service part for the specified Ford truck and classic Ford, Lincoln, and Mercury engine applications.

Quality Assurance

Mahle supplies gaskets trusted in OEM and professional repair environments, and this part is built to OEM standard specifications for consistent sealing performance.