The other issue is there is a restriction in the block itself that was enlarged in 59 to accommodate the direct feed from the main galley to the rockers. The problem with enlarging the fitting at the rear cam bearing boss is that it pulls pressure and volume from the rear cam bearing on the 56 block as opposed to the main galley on the 59 blocks. Really the better way is to use the rockers that were designed for the oiling system for that year motor.
Another alternative to drilling the fitting. Remove the steel line and fittings behind the lifter cover and install 1/8 plugs. Run an oil feed line from the main galley where the oil filter line and oil pressure switch would normally go. If you were using a filter, it would run from that port to the filter and then dump directly to the pan. Instead of funning to the bypass filter, run the line to the side of the head where the hex plug is. Its a direct feed to the rockers, feeding from the main galley, and so that would support use of the offset rockers. You lose the use of the oil canister filter (some of them, maybe all of them have an internal restriction). Dont go crazy with the id of the lines. Too big and you are robbing too much pressure from the mains.
For an oil filter, here you could change out to an after market spin on adapter and a spin on filter, say a Fram PH-8 or 8A for example, use some reducers and some copper or braided Autometer lines, and run the output of that filter (which would be less restrictive then the canaster), to the port on the side of the head. I ran a hot rod 57 235 that way for years because my offy side plate would not fit with the steel line and I only had a set of 59 rockers to use at that time.
Last edited by Dragsix; 06/12/2024 10:02 PM.
