Description
Accessory drive systems have been made more compact on Late Model V8 engines like the Ford 4.6L and the GM LS1 by machining serpentine belt grooves on the OD of the crankshaft Balancer. The crankshaft Balancer functions as a combination crank Balancer and crank pulley on these engines. Under drive Balancers are smaller in diameter than stock production crank Balancers which slows the speed of the accessories and reduces the HP required to drive them. Since performance and racing engine applications generally run at higher RPM, the water pump, alternator and power steering pump speeds can be reduced to save HP and still meet engine cooling, electrical and vehicle steering requirements.
Note 3 This is a Balancer only, LS1 F-Bodies require 2 new belts, Gates K060763 & K040378. GTO requires 2 new belts Dayco 760K6 & 405K4. BELTS ARE NOT INCLUDED. A new OEM crankshaft Balancer bolt GM 12557840 is also required when installing Balancer.
