Lets talk Roller Cam Lifters.

512Stroker said

I was under the impression that if you "tubed a block" that you were adding lubrication to lifters.
I lost.

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Negative ghostrider. Tubing the block eliminates the pressurized oil from leaking around the lifter body. The lifters are now reliant on splash oiling only. (Unless you put very small holes in the tube in each lifter bore.