The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Scott's 1972 Chevy K-20. A place to start.

ryanroo · 06-06-2013, 11:43 PM

yeah, i dont see a reason to eliminate the vacuum pump unless there is some otherwise totally unavoidable reason it has to be removed. if you had to you could build a bracket to mount a normal GM pump and drive it off one of those kilby add on vbelt pulleys.

there are also a few gear driven gerotor type pumps that were available on medium duty applications that had no air compressor. those should work but may require a better box and or a few bypass pressure adjustments.

also, there are some 4bt applications that used the saginaw style pump with no vacuum pump.

here is one

http://www.ebay.com/itm/Cummins-5-9-...item20d31e9f3c

i think the fritolay box trucks used them and maybe a f-700 type ford maybe?

ryan

06-06-2013, 11:43 PM	#132
ryanroo Senior Member Join Date: Apr 2004 Location: sw colorado Posts: 2,720	Re: Scott's 1972 Chevy K-20. A place to start. yeah, i dont see a reason to eliminate the vacuum pump unless there is some otherwise totally unavoidable reason it has to be removed. if you had to you could build a bracket to mount a normal GM pump and drive it off one of those kilby add on vbelt pulleys. there are also a few gear driven gerotor type pumps that were available on medium duty applications that had no air compressor. those should work but may require a better box and or a few bypass pressure adjustments. also, there are some 4bt applications that used the saginaw style pump with no vacuum pump. here is one http://www.ebay.com/itm/Cummins-5-9-...item20d31e9f3c i think the fritolay box trucks used them and maybe a f-700 type ford maybe? ryan __________________ 72 K20 12v build 72 K20 "parts truck" A place for your diesel swap questions