360 mopar oiling

CMcAllister · 10-18-2018, 12:30 PM

Drilling passages to the mains, opening passages in the rear of the block, port matching the pump to the cap, massaging sharp corners, tubing the block (once, what a mess, just bush the bores), even fabing a dual pickup assembly were among the first things I tried. While they are, without doubt, beneficial, It didn't address the core problem, which is keeping oil on the journals in question. Measuring oil pressure at the port on the rear of the block tells you nothing about what is happening to the pressurized oil once it gets to the #2 and 4 mains.

CMcAllister · 10-18-2018, 12:44 PM

As a side note, we ran stock bottom end, steel crank 340s to 7800 for a long time with none of these issues. Cut an iron 360 crank for in a 340 block to get some cheap stroke, and almost right away, spun a bearing and broke the rod. Put a new stock bottom end 360 together and have the same issue, although I paid attention to it and would fix it as needed rather than blow it up. Something about the increase in stroke and the iron crank that doesn't like to be spun beyond about 6800. Some folks get away with it for some reason.

10-18-2018, 12:30 PM	#1
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: 360 mopar oiling Drilling passages to the mains, opening passages in the rear of the block, port matching the pump to the cap, massaging sharp corners, tubing the block (once, what a mess, just bush the bores), even fabing a dual pickup assembly were among the first things I tried. While they are, without doubt, beneficial, It didn't address the core problem, which is keeping oil on the journals in question. Measuring oil pressure at the port on the rear of the block tells you nothing about what is happening to the pressurized oil once it gets to the #2 and 4 mains. Last edited by CMcAllister; 10-18-2018 at 12:34 PM.

10-18-2018, 12:44 PM	#2
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: 360 mopar oiling As a side note, we ran stock bottom end, steel crank 340s to 7800 for a long time with none of these issues. Cut an iron 360 crank for in a 340 block to get some cheap stroke, and almost right away, spun a bearing and broke the rod. Put a new stock bottom end 360 together and have the same issue, although I paid attention to it and would fix it as needed rather than blow it up. Something about the increase in stroke and the iron crank that doesn't like to be spun beyond about 6800. Some folks get away with it for some reason.