All 4.75″ (120.6) Bore Engines With 2 Valves Per Cylinder
Replacement thrust plates are available for the crankshaft of both the counterbored cylinder blocks, and the spacer plate cylinder blocks of the 4.75″ (120.6) bore engines given above. This instruction gives a method to find which thrust plates to use, when it is necessary to make a replacement. Measure the width of the rear main bearing journal, then make reference to the chart on page 2, to find which thrust plate is needed.
NOTE: Always install the thrust plates so the words “BLOCK SIDE” are next to the cylinder block.
Measure width (A) of the rear main bearing journal of the crankshaft. Make reference to the dimensions in the chart to find the correct thrust plates to install.