LSX Series Vacuum Pump Kits

Everything needed to install a Vacuum Pump on your LSX series powered late model GM..

*Product images may differ from actual product appearance. Gilmer Belt Not Show

Our LSX Series kit is for the popular LS1-LS7 Series Chevrolet engine and specifically designed to fit perfectly in C5 and C6 Corvettes, Firebirds, Camaros and the GTO.

LS series Chevrolet engines are well known for a lot of blow by and resultant contamination of the intake charge with oil forced past the rings into the combustion chamber. This kit eliminates the PCV valve, allows the rings to seal more effectively and reduces oil contamination of the intake charge which results in added horsepower. A side benefit of the negative crankcase pressure the vacuum pump creates is that it also helps to eliminate unsightly oil leaks.

The GZ Motorsports LSX kits are available with either the 22cfm VP101A Sportsman or a 30cfm VP103 Pro Series Vacuum Pump. We recommend the sportsman pump kit for naturally aspirated cars and the pro series pump for cars that run a power adder such as nitrous, blower or turbochargers.

The two different styles of Kits below are designed for two separate applications - one for standard belt drive with belt tensioner, and the other for those using a electric water pump which do not use a belt tensioner. If in doubt which one to use please give us a call at (209) 296-3793.

You also might be interested in viewing our LSX sample installations

This new LSX Kit uses the popular GZMS Sportsman vacuum pump (VP101A) which is bolted to the head on the passenger side with a custom stud bolt and set of spacers. A custom designed brace bracket attached to the vacuum pump and the head. The stock tensioner pulley is replaced by a custom designed billet aluminum pulley that is slightly larger (3.5" dia), 6 rib serpentine with a 14 tooth Gilmer pulley combined to drive the pump. The pump is driven by a 5.4" 46 tooth Gilmer vacuum pump pulley using an included 22.5" long Gilmer belt, which results in a perfect pump speed of 63% engine speed. The inlet from the pump is attached to a custom designed billet replacement oil fill cap (VCB103), which also holds the vacuum control valve that comes with the kit (VCV103). The outlet of the pump goes to a custom designed double baffled aluminum breather tank (BT3) that sits snugly between the frame and the radiator on the passenger side. 5' of #10 Stainless braided hose and (2) #10AN 90's, (2) #10AN straights along with the necessary fittings for the pump and the tank are supplied with the kit for an even more simple installation. Also included are the stud bolt and spacer for the head and the bracket with 10 mm cap screw.

Everything is easily installed on the engine with the only typical modifications being to bend the AC line out of the way of the vacuum pump pulley and sometimes needing to loosen up the radiator reservoir and moving as far outward as possible to avoid the end of the brace bracket. The provided Gilmer belt is the correct length and varies between tight and loose depending on engine temperature. The installed kit makes in excess of 15 or so inches of vacuum without the vacuum control valve, which can be adjusted lower to suit the owner and engine builders desires.

Comes with V-belts and pulleys for use with cars that have an electric water pump. This model is only used when the serpentine belt tensioner is not utilized. The added crank pulley is an option only when there is clearance to run it and install it.

Note: installation of the crank pulley may require lifting the front of the engine or dropping the rack and pinion to allow access. Also pulley requires at least an inch of clearance in front of the balancer for the V belt pulley.