hard or soft copper line for a valley oil gallery bypass line?

Newbomb Turk said
Post his notes if you don’t mind. I haven’t read those in probably two decades. I’m sorry to say I can’t even remember when he passed.

And I just learned today a brilliant guy on another forum passed in December.

To that end, you are making my point. My memory was he was using pushrod oiling.

Once you block the oil to the drivers side lifters IF you are using pushrod oiling OR hydraulic lifters although I can’t reason why you would run a hydraulic lifter in a performance engine except for rules then you have to get oil there somehow.

To that end, the crossover tube works for that specific issue. It won’t save a main bearing.

I also get why he was back feeding the number one main.

I suggest there are better ways to get oil over there without the crossover, but the tube does that.

What it doesn’t do is fix the issue of oiling the bearings. It doesn’t slow down the oil.

That’s why I asked the OP why he’s was doing it. His answer had nothing to do with pushrod oiling. His answer was he was looking for more reliability concerning bearing oiling. The crossover doesn’t do that.

I am not making your point. If his class rules required oil at the lifters, and you bushed lifter bores, you could restrict flow to your discretion with the bushing and leave the stocking method of oiling off #1 main as is. Sanborn claims this fails #1 main.
Just as you spoke about those old cams with a groove on # 2&4 cam journals robbing the mains of oil. I had one of those cams. Failed my 2&4 mains after 40 runs.
You cannot feed other areas of the motor off of a main bearing because you get a pressure drop at that bearing. The stock oiling feeds all the drivers side lifters from number one main.
So the fix is to block the feed on the passenger side. Then re-supply the oil to number one in the opposite side and direction of feed with a crossover tube.
The stroker small block book method goes even further and does not allow any cam bearings that are fed by the mains, to feed the rockers, re-enforcing the supply to 2&4 mains as well.