I did reuse the old, wider rear cam bearing as it wasn't beat up like the rest of them. I think the engine was either overheated or run low on oil as there was melted babbit throughout the engine oil passages (mains, rods, cam bearings all gone except rear cam brg). What I did was to create a slot between the two oil holes in the rear cam bearing and made sure it lined up with the small hole in the block next to the groove already cut in the block which the wider rear cam bearing covers when installed. The old cam had a slot in the rear journal which only went 1/4 of the way around the circumference. This would allow oil to pass from one hole to the next only when the slot uncovered the two holes. By slotting the rear cam bearing, oil should be allowed passage between the block groove and the block hole 100% of the time to feed lifters even with an ungrooved/slotted rear cam journal. I fail to see why this wouldn't work as I've been told by some. Can you explain why the slotted rear cam bearing used in conjunction with a modern ungrooved cam won't work? My only other reply to date said he did something similar way back when and it seemed to work out ok.
