Seems like most of those guys prefer the vac pumps to the exhaust systems. I doubt I would have an issue running the exhaust setup with my exhaust and all that, but still.
That thread seems to indicate the vac pumps are slightly better performance wise. The other advantage is I could recycle the oil back into the system.
You got to be subjective, most guys that ran the exhaust evac said it worked great or gave tips to make it work. Just like breathers vs catch cans vs closed separator you will always have guys dead set on a certain way. I have learned when things are really expensive guys will always try to over justify their expense to guys that got the same result cheaper so take that with a grain of salt. Also a lot of those guys set on a vacuum pump are bigger displacement big block motors with more crankcase volume. Looks like most guys saw 4-10"with the header evac setup which most described as perfect and fixing their problem. No more oil seal leaks or blowing out gaskets etc. For an older big displacement na engine, by all means run a belt driven vac pump, they are proven to work as well. For modern lower displacement motors with tighter clearances and ring gaps you don't need a ton of vac all the time.
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