dave
the orifice in fig 4 on my block is 11/32.
there are provisions for the oil line from the cam to the middle of the block(behind the side cover) but i don't have the line do i need it?.
i have the rocker shaft oil tube and hollow bolt.
i'm guessing that since the head and rocker assy came off a 235 that the shafts are not the correct ones for the 59 261 oiling system.
this block has never been run. i got it from an old guy whose dad got it from the chevy dealer in their town when it closed down about 20 years ago. i got it with cam, crank and pistons only. i have an oil pump for it and valve and side covers
i need an oil pan
