[GTX JOHN]

Boy am I showing my age!


ANY Block stamped HP has the large camshaft and better valve springs....
NO other difference in block....HP had windage tray ( as well as
some Industrial engines ).

Difference between HP and HP2 was ONLY the Shift when engine
was assembled:
HP = Day Shift
HP2=Swing Shift


There are many rumors over the years....but I believe that is the true story!