Mercruiser 350 CID / 5.7L Gen + Marine Engine Specifications

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Unit Of Measurement

In. (mm)

Model

350 CID / 5.7L

Displacement

350 CID (5.7 Liter)

Bore

4.00(101.6)

Stroke

3.48(88.4)

Compression Ratio

9.4:1

Heads

Cast Iron

Intake Manifold

Cast Aluminum

Block

Cast Iron (2 Bolt Main Bearing Caps)

Rods

Powdered Metal

Crankshaft

Cast Iron

Pistons

Cast Aluminum

Camshaft

Steel

350 CID Gen + Engine Specifications

Unit Of Measurement

In. (mm)

NOTE: These specifications cover only Gen + engines.

CYLINDER BORE

Diameter			4.0007-4.0017 (101.618-101.643)
Out Of Round		Production	.0005(0.12) Max
		Service	.002(0.05) Max
Taper	Production	Thrust Side	.0005(0.012) Max
		Relief Side	.001(0.025) Max
	Service		.001(0.025) Over Production

PISTON CLEARANCE

Production	.0007-.0021(0.018-0.053) Max
Service	.0027(0.068) Max

PISTON RING: COMPRESSION

Groove Clearance	Production	Top	.0012-.0032(0.030-0.081)
		2^nd
	Service		High Limit Production + .001(0.025)
Gap	Production	Top	.010-.020(0.25-0.51)
		2^nd	.018-.026(0.46-0.66)
	Service		High Limit Production + .010(0.25)

PISTON RING: OIL

Groove Clearance	Production	.002-.007(0.051-0.17)
Groove Clearance	Service	High Limit Production + .001(0.025)
Gap	Production	.010-.030(0.25-0.76)
Gap	Service Limit	High Limit Production + .001(0.25)

PISTON PIN

Diameter		.9270-.9271(23.545-23.548)
Clearance	Production	.0004-.0008(0.0120-0.0210)
	Service Limit	.0040(0.025) Max
Fit in Rod		.0008-.0016(0.021-0.40) Interference

CRANKSHAFT

Main

Journal

Diameter

No. 1

2.4484-2.4493(62.189-62.212)

No. 2, 3, 4

2.4481-2.4490(62.182-62.205)

No. 5

2.4479-2.4488(62.177-62.199)

Taper

Production

.0002(0.005) Max

Service

.001(0.025) Max

Out of Round

Production

.0002(0.005) Max

Service

.001(0.005) Max

Main Bearing

Clearance

Production

No. 1

.0007-.0021(0.018-0.053)

No. 2, 3, 4

.0022-.00610(0.0009-0.0024)

No. 5

.00250-.00690(0.0010-0.0027)

Service

No. 1

.0010-.0020(0.250-0.510)

No. 2, 3, 4

.0010-.0025(0.0250-0.0640)

No. 5

.0025-.0035(0.0760-0.0380)

Crankshaft End Play

.002-.008(0.0500-0.2000)

Connecting Rod

Journal

Diameter

2.0978-2.0998(53.2840-53.3340)

Taper

Production

.0003(0.007) Max

Service

.001(0.025) Max

Out of Round

Production

.0003(0.007) Max

Service

.001(0.025) Max

Rod Bearing Clearance

Production

.0006-.0014(0.16-0.35)

Service

.0010-.0030(0.025-0.076)

Rod Side Clearance

.006-.014(0.15-0.35)

VALVE SYSTEM

Lifter Type			Roller Hydraulic
Rocker Arm Ratio			1.50 to 1
Valve Lift		Intake	.431(10.947)
		Exhaust	.450(11.43)
Valve Lash (Intake & Exhaust)			1 Turn Down from Zero Lash
Face Angle (Intake & Exhaust)			45°
Seat Angle (Intake & Exhaust)			46°
Seat Runout (Intake & Exhaust)			.002(0.05) Max
Seat Width		Intake	.040-.0625(1.02-1.65)
		Exhaust	.065-.098(1.65-2.49)
Stem Clearance	Production	Intake	.0010-.0027(0.025-0.069)
		Exhaust	.0010-.0027(0.025-0.069)
	Service	Intake	High Limit Production + .001(0.025)
		Exhaust	High Limit Production + .0002(0.050)

VALVE SPRING

Valve Spring	Free Length		2.02(51.3)
	Pressure	Valve Closed	76-84 Lb. Ft.(338-374N) at 1.70(43.18)
	Pressure	Valve Open	187-203 Lb. Ft. (832-903 N) at 1.27(32.26)
	Installed Height	Intake	1.69-1.71(42.92-43.43)

350 Gen + Engine Specifications

Unit Of Measurement

In. (mm)

CAMSHAFT

Lobe Lift + .002(0.051)	Exhaust	.300(7.62)
	Intake	.287(7.289)
Duration at .050 In. (1.27 mm) Cam Lift	Exhaust	.294(7.467)
	Intake	.307(7.797)
Journal Diameter		1.8682-1.8692(47.440-47.490)
End Play		.011-0.030(0.004-0.0012)
Timing Chain Deflection [LH Rotation]		.375(9.5) from taut position [total .75(19)]

FLYWHEEL

Runout

.008(0.203) Max

CYLINDER HEAD

Gasket Surface Flatness

.004(0.10) Overall Maximum

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