Posted by Joe Cimoch [68.186.242.95] on Saturday, November 10, 2012 at 09:11:54 :
Poly 318 hydraulic lifter pushrod part number
Melling MPR-153 for hydraulic tappets (lifters)
MPR-153 8.364" 5/16" diameter Ends A & D
Available from Auto Zone $3.99
Number came from Gary Pavlovich, and it fits.
Fun fact:
According to the 1960 Truck Parts Catalog;
Page 9-10 ENGINE
NOTE 5: An eight cylinder 318 cubic inch displacement engine, with HYDRAULIC VALVE LIFTERS, is standard for models: P8-W300, P8-D400, P8-D500, P8-C500, P8-W500, P8-S500, P8-D600, P8-S600.