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Compression Pressure

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

289" 130-170
352" 160-170
390" 2-Bbl. 160-200
  4-Bbl. 170-200
427" 160-170
428" 170-200
VALVE TAPPET CLEARANCE

289" (Except 271 HP) (2) Hydraulic
  (271 HP) Cold .022" Int. & Exh.
    Hot (2).018" Int. & Exh.
352" (1) Hydraulic
390" (1) Hydraulic
428" Police & 427" (Cold) .028" Int. & Exh.
      (Hot) (2).025" Int. & Exh.
428" (Except Police) (1) Hydraulic
(1) With lifter fully collapsed, clearance between rocker arm and valve stem tip should be.082-.152".
(2) With lifter fully collapsed, clearance between rocker arm and valve stem tip should be.050-.150".
(3) With engine at normal operating temperature.
VACUUM READING

289" (Except 271 HP), 352" 18" at idle
289" (271 HP) 15" at idle
390", 428" (Except Police) 17" at idle
428" Police 16" at idle
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