Here’s a question for the motor philosophers.
My '38 SS has a breather tube on the left side. These are often called a road draft tube, the theory being that road drafts suck the crankcase vapors out this tube as you drive. But where does the air come in? Is it just the blow-by from the pistons?
My '50 Mark V has the same breather tube on the left side, and also a breather hole in the rocker cover, which connects to the air cleaner body.
Which way does the air flow? Does the air flow into the crankcase from the air cleaner to the rocker cover and out through the side tube? Or does the air flow up the side tube and out the rocker cover into the air cleaner, and thus into the carbs?
Anybody ever run a test to see?