Pontiac OHC Specifications and Technical Information

Installation Instructions

7 Position Timing Pulley Installation

Camshaft Installation

Cylinder Head Rebuilding and Specifications

OHC Oil Pump Rebuilding

Sigma6 Installation

 

Torque Specifications (ft.-lbs.) (source:  Pontiac Service Manual)

Engine Main Bearing Cap Cylinder Head Flywheel to Crankshaft Connecting Rod Bearing Cap Accessory Housing Fuel Pump Mounting Intake Manifold to Head Exhaust Manifold to Head Oil Pan Camshaft Rocker Arm Cover Vibration Damper
230 100 93 60 33 15 15 30 28 12 40 15 160
250 100 95 60 33 15 15 30 30 12 40 15 160

 

Block Casting Code Displacement Year Block Stamping Adv. HP C. R. Head Code Crankshaft Carburetion Cam Code
  230 cu. in. 1966
ZK (manual)
ZN (auto)
 165@4700 9.0:1 9782005 9782279 1 bbl. A
  230 cu. in. 1966
ZD (manual)
ZR (manual with A.I.R.)
ZE (auto)
ZL (auto with A.I.R.)
 207@5200 10.5:1 9782229 9782279 4 bbl.

7026261 manual

7026260 auto

 B
  230 cu. in. 1967
ZK (manual)
ZS (manual with A.I.R.)
ZN (auto)
ZM (auto with A.I.R.)
 165@4700 9.0:1 9778692 9782279 1 bbl. A
  230 cu. in. 1967
ZD (manual)
ZR (manual with A.I.R.)
ZE (auto)
ZL (auto with A.I.R.)
 215@5200 10.5:1 9778693 9782279 4 bbl.

7027269 manual

7027268 auto

 B
  250 cu. in. 1968
ZK (manual)
ZN (auto)
 175@4800 9.0:1 9791194 9790154 1 bbl.
546671
9790826=C
  250 cu. in. 1968
ZO (manual)
ZE (auto)
 215@5200 10.5:1 9791195 9790154 4 bbl.

7028261 manual

7028260 auto
546670
9792539=E
  250 cu. in. 1969
ZK (manual, 30 degree seats)
ZC (manual, 45 degree seats)
ZN (auto, 30 degree seats)
ZF (auto, 45 degree seats)
 175@4800 9.0:1 9791194 (30 degree seats)

9795456 (45 degree seats)

 9790154 1 bbl.
546671
9790826=C
  250 cu. in. 1969
ZD (manual, 30 degree seats)
ZE (auto, 30 degree seats)
ZH (manual, 45 degree seats)
ZL (auto, 45 degree seats)
 215@5200

230 Manual

 10.5:1 9791195 (30 degree seats)

9795457 (45 degree seats)

 9790154 4 bbl.

7029261 manual

7029260 auto
546670

9792539=E

 
546673
9796327=H (230HP manual)