Ok, Let me try.
1)If you want to oil thru the pushrods you must bush the block (any block) the bushing has an oiling orfice.
2)The R-1/R-3 block require a longer roller tappet because of a tall tappet boss. Standard solid or hydralic(sp?) lifter. But for a solid or roller tappet lifter you must block the oil paasage in the block. Oiling thru the head.
3)The 340/360 block use a standard roller,solid or hydralic lifter but for the solid and roller tappet you must block off the oil passage. Oiling thru the head.


later matt s