I don't think a normal single port vacuum pump will work, the smog pumps are dual port, one to pull and one to exit.
That's my dilemma, the smog pumps are 2-5" which is something but not really a bump in HP like 10-15" is.
There's a guy that swapped in a more powerful brushless motor in his GM smog pump and that seems like the way to go. Get maybe 8" and gain in every category.
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct at 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10" 0 Stat, Ricks SS Gas Tank, Magna 4303, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" Headers & Borla Pro XS 3" Muffs, Alum Rad & Dual Fans, 12:1 Box, UMI Control Arms & Viking Berz Fr + Rear CO Shocks, Hella UP28 Vac Pump
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