My take on the oiling system crossover tube for the small block
What a crock of nonsense. I don't care who wrote that and I respect Bob Mullen but that crossover tube doesn't fix jack ****, especially not to 10,000 RPM. You'd be lucky to make it over 8k.
My question is why not make that mod to a Chevy? The oiling systems are SO CLOSE that the Chevy should need it too. But they don't because that crossover doesn't work.
As I posted earlier, if you think hydraulic lifters and RPM go together you've never tried it. Especially with Chrysler cam side rocker geometry. Most of my testing was you can spring them higher than 6500 but the valve train is so out of control you don't make any power.
I've said it before and it is worthy of repeating. If I thought I was going to try and race with hydraulic lifters (repeat that many times and listen to how dumb it sounds) I'd either tube the passenger gallery and and restrict the drivers side with .187ish hole and a .0625 hole in the tube where it breaks through the lifter boss, or I'd bush the bores and use a .0625 hole in the bushing to the gallery as that's all the oil they need.
The crossover does NOTHING to fix high RPM oiling issues and it doesn't matter who says it does.