Mercury MerCruiser MCM 7.4L MPI User Manual

454 CID (7.4L) / 502 CID (8.2L) SERVICE MANUAL NUMBER 23
Page 3A-12
90-861326--1 MARCH 1999
7.4L MPI (L-29) Engine Specifications
NOTICE
Unit Of Measurement: U.S. Quarts (Liters)
All capacities are approximate fluid measures.
MODEL 7.4L
Displacement 454 cid (7.4L)
Bore 4.25 (108)
Stroke 4.00 (101.6)
Compression Ratio 9.3:1
Heads Cast Iron (Oval Port)
Intake Manifold
Lower Half: Cast Iron
Upper Half: Aluminum
Block Cast Iron (4 Bolt Main Bearing Caps)
Rods Forged Steel
Pistons Cast Aluminum
Crankshaft Nodular Cast Iron
Camshaft Steel
CYLINDER BORE
MODEL 7.4L
Diameter 4.2500-4.2507 (107.950-107.968)
Out of Round
Production .001 (0.0254) Max
Out
of
Round
Service .002 (0.051) Max
Production
Thrust Side .0005 (0.0127) Max
Taper
Production
Relief Side .001 (0.0254) Max
Service .001 (0.0254) Over Production
PISTON
MODEL 7.4L
Clearance
Production .0018-.0030 (0.0457-0.0762)
Clearance
Service .0018 (0.0457) Max
Downloaded from https://needmanual.com/!
Index

Mercury MerCruiser MCM 7.4L MPI Specifications

General

Engine Type	V8
Bore	4.25 in (108 mm)
Compression Ratio	8.6:1
Ignition System	Electronic Ignition
Alternator	65 Amp
Displacement	7.4L (454 cu in)
Fuel System	Multi-Port Fuel Injection (MPI)
Horsepower	310 HP
Torque	450 lb-ft
Cooling System	Closed Cooling
Fuel Requirement	87 octane (minimum)
Stroke	4.00 in (101.6 mm)