My take on the oiling system crossover tube for the small block
Jad I can tell you the fool who wrote the page you have posted here is full of **** and HE doesn't understand how the oiling system works. I've already explained (and done it many times with my own engines and used to have the junk parts to prove that author is stupid or lying) how you correct the oil timing to make a Chrysler oil at high RPM. The tube does nothing.
Look at a SBC and compare that to a SBM. They are essentially the exact same EXCEPT in one area. The oil feed holes in the crank are exactly the same. The difference is the location of the oil hole in the main bearing bulk head. And a SBC will oil way past 10k. And that's before priority oiling came along.
I just hate to see guys wasting time and money on junk that doesn't nothing. Piss on Chrysler for not correcting this decades ago.