Mercury MerCruiser MCM 454 Mag MPI Service Manual page 216

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