LA small block,Do you put an oil passage in your head stud?
I went to the shop and was talking to my son about this thread. He said he saw some of you mentioned other engines and referred to them as an explanation for restrictors. So he was explaining to me some of the oiling. Now I may not have some things correct but this is how I understood things
Ford FE the cam gets the oil 1st and splits to the mains and rockers. They restrict the rockers so the mains get more oil first.
Chevy restricts the rockers with the pushrods.
Big block mopar
drill holes into through the oil passages into the oil galley from the passage to the head and install set screws set in each passage to seal the open end of the hole you drilled. Reclock number 4 cam bearing to cover oil feeds to head and drill new hole to feed the main bearing passage. Use full grove main bearings. this will supply oiling to the mains and rods on both sides.This will also provide full time oiling to the heads leading to the rockers. This has been covered on this site before . Many times
Small block mopar he said many things have been tried over the years like the tube from bank to bank blocking of the feed from number one main. He won't do that. He does other mods basically the same as the big block. but if studded he always mills a groove in the studs. This provides positive direct feed .
He mentioned about the post above from Col_Steve He said that oiling mod is the correct way .
The one thing he doesn't like is depending on the circumference of the stud clearance for oil. The oil feeds are on the one side of the stud . You can never say for sure that the stud has .010 around the complete stud What if the stud is off center in the hole .020 on one side and and tight on that side and seals off the feed holes . Once the head is in place you cannot tell how close it is to that side. Why build pressure around the stud. Did you all ever see how hot a restricted oil valve gets. Think of the heat from pressure and flow next to the stud. I'll stay with the grove in the stud.
Most Modified nascar and sprint car Engines have spray bars in the covers Just to cool the springs.. Helps prevent spring damage if you keep them cool.
My son is on this site. He doesn't post much I do that. He just reads some of the threads.
If I’m getting what Col Steve is saying, and he can correct me if I’m wrong...all he is doing is moving the feed to the rockers from the feed up from the mains by blocking the hole with the cam bearing and picking the oil up from the lifter gallery.
There is nothing wrong with that, except you are oiling rockers with the oil going to the mains before it gets there. As it is OE, the oil going to the rockers has to at least go to the mains and rods on the way up to the rockers. The OE way only pulls oil off the number 2 and 4 mains, where his way is pulling the oil off all the mains.
I have looked at this at length years ago, but not of a concern for rocker oiling. I didn’t do it, because it still takes oil from the mains. That was when I externally oiled the shafts. In the end that was a giant PITA and not worth the hassles.
I have been looking at other ways to not pull oil from either the mains or before the mains. That would mean any oil going to the mains and rods would have to get their first and the only leaks after the mains would be the leaks at the cam bearings.
I’m not sure how I will do it, but at this point I only see 2 ways to do it. One requires a bulkhead fitting and a couple of hoses and the other requires some hoses off the oil pressure feed port.
I have to consider if it’s even worth the effort, but IMO any time you can feed the rockers with oil that didn’t come off those two mains alone that’s a better way to do it. Not for the sake of the rockers but for the sake of the main and rod bearings.
