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Message: <blockquote data-quote="Larry Morgan" data-source="post: 1304504" data-attributes="member: 4676">They most definitely do, they keep the entire crankcase under a vacuum. Last motor I saw dyno'd held like 11hg of vacuum after it was shut off. Needle just sat there.  They want as little windage or drag on the moving parts as possible. They don't have guys who's entire job in life is to make their motors gain horsepower for nothing. Haha.Some people argue that cam flex/twist can throw timing off a few degrees or so. The physics don't lie, and in that case they are right. However, I've seen motors generating upwards of 1100HP do just fine of a rear distributor. The big boys use a belt driven distributor, though.</blockquote>