Compression Pressure

Maximum variation between cylinders is 20 lbs. (all engines) .

Fig 1: Firing Order (All Engines)

Courtesy of FORD MOTOR CO.

VALVE TAPPET CLEARANCE

All Except 428" Police

⁽¹⁾ Hydraulic

423" Police (Cold)

.028" Int. & Exh.

(Hot)

⁽²⁾.025" Int. & Exh.

⁽¹⁾	With lifter fully collapsed, clearance between rocker arm and valve stem tip should be.082-.152" (289").050-.150" (All Others).

⁽²⁾	With engine at normal operating temperature.

VACUUM READING