Mercury 305 CID - Page 202

3A-10 - ENGINES 90-823225--1 1096
5.0L / 305 CID / 5.7L / 350 CID Engine Specifications (Does Not Include Gen +)
Unit Of Measurement
In. (mm)
VALVE SPRING
ENGINE 5.0L / 305 CID / 5.7L / 350 CID
Valve Spring
24-48347
Lavender
Stripe
Free Length 2.03 (51.6) (See Note 1)
Valve Spring
24 4834
Pressure
(NOTE 2)
Valve
Closed
76-84 Lb. Ft. (103-113 N⋅m) at 1.785 (43.16)
pg
24-48347
Lavender
(NOTE
2)
Valve Open 194-204 Lb. Ft. (263-279 N⋅m) at 1.250 (31.75)
Lavender
Stripe
Installed Height Intake 1.7 [1-45/64] (43)
Damper
Free Length 1.86 [1-55/64] (47)
Damper
Approximate Number of Coils 4
NOTE 1: Engines are equipped either roller hydraulic (5.7L / 350 CID engines only) or flat hydraulic depending
on model designation.
NOTE 2: Test spring pressure with damper removed
CAMSHAFT AND DRIVE
ENGINE
5.0L / 305 CID 5.7L / 350 CID
Journal Diameter 1.8682-1.8692 (47.452-47.478)
1.8682-1.8692
(47.452-47.478)
Journal Out Of Round .001 (0.025) Max
Camshaft Runout .002 (0.051) Max
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 (0.1016) Overall Maximum