FixVault

Compression Pressure

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

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

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