When I upgraded to this temporary mid-level engine (or it's immediate predecessor) I was worried the much larger cam would deprive my terrible brakes of even more boost, so I replaced the gas evap cannister, long since disconnected by a previous owner, with a vacuum reservoir of about the same dimension and bought one of the $250ish vacuum pumps from SSBC to run to it - which I mounted in the nose cone.
It turned out both cams I've used, while having decent lift and duration, have little overlap and it wasn't needed. I therefore routed it into one of the valve cover ports in a similar manner to the PCV system.
Both combined were insufficient to remove considerable crankcase pressure developed by a higher cylinder pressure higher performance engine with nitrous pistons and the requisite somewhat looser rings for longevity.
I believe that vac pump pulled about 10A...so 120 watts or, at most, 1/6th hp (more like 1/10-1/8 if it was really efficient.) I think this is just way too little air being moved to overcome blowby on a higher powered engine at sustained higher RPM.
I believe this is why the 3- and 4-vaned mechanical vac pumps were developed as they can access so much more power and are automatically weighted to engine RPM. I know creating a significant vacuum in the crankcase, in addition to removing all volatiles (especially water - not just gasoline), really helps to seat the rings and greatly reduce loss of power from air resistance below the pistons (which is proportional to RPM and the diameter of the pistons - bad in a big inch big block or
a high revving small block.)
I was going to install one, after about the fifth oil pan gasket or valve cover gasket or distributor gasket leaked while being pushed out from the excess crankcase pressure, when someone suggested the header venturi system. It was a lot easier to install (and cheaper) and so I gave it a whirl and have been pleased with it, except for the vacuum is too
much at times and pulls oil up to where it can leak after shutdown. (I will shortly put a restrictor in the tubes or more baffles in the valve cover riser pipes to stop this silliness...)
Whenever I finally build the real engine that started this absurd project a half decade ago, I will use the biggest, baddest 4-vaned mechanical vacuum pump out there at the time(and a dry sump oiling system, since I'll have that "free" extra vacuum source to work with....)
If I could find the silly thing, I'd sell you the SSBC vacuum pump for cheap...if.....I..... could.....find.......it....
BTW, the SSBC one is..."amusingly...quaintly....invigorati ngly!" loud. You may really want to test whatever one you get if possible (if you have a nice and quiet car...which I do not.) This thing sounded like a mini aircompressor..which..is...exactly...wha t..it...is...
I could usually hear it over the headers, over the (previous) mechanical fan, even over the TCI Rattler harmonic balancer at shutdown. We're not talking gear drive noisy...but...well..."significant"