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Sierra Marine Parts Catalog: Internal Engine Components

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18-4495
CYLINDER HEAD ASSEMBLY
18-4491
Replaces: MerCruiser 949-4057,
CYLINDER HEAD ASSEMBLY
949-5798,
Replaces: MerCruiser 938-827178 1
OMC 986086,988163,3854339, Volvo
Replaces 4.3L Vortec V-6 (1996-Up) with screw in rocker
3854339,3853894
arm studs (non-adjustable valve train), 8 intake manifold
mounting bolts, center mount valve cover. NOTE: not for
Fits: (1980& Up) 5.0L Ford with D-shape 58 cc
use with engines using factory roller rocker arms.
combustion chamber
18-4511
18-4512
18-4501
TIMING COvER
TIMING COvER
CYLINDER HEAD
GM 4.3L-composite with sensor port
GM 4.3L composite w/o sensor port
Fits: 5.0L Vortec
18-4514
18-4513
18-4516
TIMING COvER
TIMING COvER
RING GEAR-FLYWHEEL
GM 5.0L/5.7L-composite w/o sensor port
GM 5.0L/5.7L-composite with sensor port
14" GM flywheel w/ 168 teeth
18-4517
18-4518
18-4519
RING GEAR-FLYWHEEL
FLYWHEEL
FLYWHEEL
12" GM flywheel w/ 153 teeth
14" 4.3L V-6, 1 piece main 1987 and up
14" 5.0/5.7L, 1 piece main 1987 and UP
18-4521
18-4522
18-4523
FLYWHEEL
FLYWHEEL
FLYWHEEL
568
14" small-block GM, 2 piece main, pre 1987
14" 454, Gen IV w/ 2 piece rear main
14" 454, Gen V & VI w/ 1 piece rear main