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Home >> Ford >> 1968 >> Falcon Base, 4.7L Eng VIN C, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Tune-Up - V8 >> Engine Identification >> Compression Pressure

Compression Pressure

Maximum variation between cylinders is 20 lbs. for all engines  .

289", 302" 130-170
390" (1) 1.70-210
427" 1.60-200
428" 170-210
429" 180-200
(1) 390" 2-Bbl. with regular fuel 160-200.
VALVE TAPPET CLEARANCE

Engine (1) Hydraulic (Inches)
289" (2) .067-.167
302" .067-.167
390" 427", 428" .100-.200
429" .075-.175
(1) Measured between rocker arm and valve stem tip with lifter fully collapsed.
(2) 289" Hi Performance, Mechanical lifter.022" Cold;.018" Hot.
VACUUM READING

289" 18" at idle
  Hi Perf 15" at idle
302" 18" at idle
390" 17" at idle
427" 15" at idle
428", 429" 17" at idle
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