FixVault

Compression Pressure

Pressure is with engine worm, plugs removed, throttle wide open, at cranking speed. 

Engine Pressure (Lbs.) (1) Variation (Lbs.)
273" 2-Bbl. 120-150 20
  4-Bbl. 130-165 25
318" 125-155 25
361" 125-155 20
383" 2-Bbl. 125-155 20
  4-Bbl. 130-165 25
426" 130-165 25
440" 130-165 25
(1) Maximum variation between cylinders.
VALVE TAPPET CLEARANCE

273", 318" .013" Int., .021" Exh. Hot
361", 383", 426", 440" (1) Zero Lash, Hydraulic
(1) Clearance between valve stem tip and rocker arm pad with lifter fully collapsed should be .060-.210".