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Engine
1973 to 1976 Model Years
Displacement455 cubic inches
Carburetor4 barrel
Compression Ratio8.5:1
Bore4.125 in.
Stroke4.250 in.
Firing Order1-8-4-3-6-5-7-2
Dwell30 degrees
Timing8 degrees BTDC @ 1100 RPM
Slow Idle Screw600 RPM in Drive
Fast Idle Screw1100 RPM in Park or Neutral
Spark PlugsAC R45S
Spark Plug Gap.040 in.
Valve LashHydraulic
Idle MixtureDo Not Remove Caps
Fuel Requirements91 Octane or Higher
Source - 1973 GMC Motorhome Owner's Manual


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