Cam Oiling Changes
Now is a good time to discuss the cam bearings and the feeding of the heads by the number 2 and number 4 bearing journals.
The purposes of these mods are to keep the oil going to the bearings instead of blowing out at the cam journal.
There are 2 ways to restrict the oil going to the cam bearing. The first is the hardest. You go into the oiling passage from the main bearing saddles. Tap the passage to 5/16-18 then drill a 1/8" hole in a set screw and Loctite it in place. This is done on number 1, 3 and 5. Number 2 and 4 are feeding the heads so we aren’t restricting them.
The second way is to restrict the oil by drilling a 1/8 hole in the cam bearings. Then install them so only the one hole lines up with the main bearing feed passage. This will block off the oiling to the heads. The heads will be oiled by a mod to the passages in the lifter valley.
By restricting the oil to the cam bearings we are holding back oil to be used by the crankshaft and rod bearings while still lubing the cam bearings but not the heads.
