A groove 1/32 deep and 1/16 wide is being ground lengthwise on the front and rear intake valve crankcase push rods. This is being done to increase the oiling of the intake valve and guide. When servicing a 339 74, if the intake push rods do not carry the groove, it is a very simple and easy operation to grind a groove the length of the Push rod with an ordinary grinding wheel, using the sharp corner, which will no doubt grind a wider groove, but it will hot have to be so deep. This operation will tend to make the intake valves quieter at the tappet clearance, and eliminate intake valve
stem and valve guide wear.
Leave a Comment