Jesel Adjustable Timing Belt Pulley Spider - Minus 10 to 10 Degrees - Big Block Chevy 7001 Reduce under hood temperatures a

Reduce under hood temperatures a realistic 50%

of bend compared to normal header to increase flow

6 AN and 1-1/4 in

GM Fullsize Truck 1988-2012

Jesel Adjustable Timing Belt Pulley Spider - Minus 10 to 10 Degrees - Big Block Chevy 7001 Reduce under hood temperatures aProduct Description: Timing Belt Pulley Spider Adjustable Minus 10 to 10 Degrees Aluminum Natural Big Block Chevy Dan Jesel realized early on that the success and demand for his high end valvetrain components was in part dependent on huge valve lifts, unheard of spring pressures and rpm that most thought was impossible. So he started on a 10 year quest to perfect the roller lifter. After nearly nine years of R&D and endless testing, Dan brought the