Atomic 4 Marine Engines Torque & Tune Up Specifications: Bolt Location Torque Specification (oiled) Cylinder Head 35 Ft Lbs Exhaust Manifold 25 Ft Lbs Flywheel 35 Ft Lbs Main Bearings 60 Ft Lbs Rod Bearings 25 Ft Lbs Output Coupling Nut 125 Ft Lbs Idler Gear 90 Ft Lbs Spark Plugs 30 Ft Lbs (dry) Tune Up Specifications: Spark Plugs Champion J8C, J12C Plug Gap .035’’ Point Gap .020’’ (old) .025 (new) Dwell Angle 38 deg (old) 32 deg (new) Timing TDC at low idle Firing Order 1 - 2 - 4 - 3 Intake Tappet Clearance Cold 0.010’’ Exhaust Tappet Clearance Cold 0.012’’ Normal Compression Pressure: 90 to 125 psi (with all spark plugs removed & throttle open)