ATI Performance Products is proud to introduce its Super Damper for the GM L8T Truck and Gen V Ecotec3 applications. Part #917306 is a 7.480-inch aluminum shell damper with a 4-groove belt drive in the outer shell and it is our replacement for OEM GM Part #12680364 that fits GM's 2020+ 6.6L L8T crate engine as well as the (2018+) 4.3L LV3, (2019+) 5.3L L84, and 6.2L L87 engines! Many other truck options are available as well. This damper requires a bolt on, front pulley. You can run a 6 groove belt on any of the pulleys starting in the groove closest to the engine.

ATI offers a variety of front drive pulleys in OEM diameter, underdriven and overdriven sizes:

Diameter % UD/OD	Grooves	Drive Diameter	Part #
10% UD	6	6.773"	916359
OEM	6	7.525"	916358
4% OD	8	7.835"	916153
10% OD	8	8.295"	916105
15.5% OD	8	8.690"	916106
30% OD	10	9.770"	916159

This damper comes with laser-etched timing marks, a single 3/16 keyway 4140 Heat Treat hub, and exceeds SFI 18.1 Certification.

OEM dampers are optimally tuned to a narrow band of “perceived normal driving conditions” and do not perform well outside of those limits. The ATI Super Damper can handle any engine speeds and driving conditions that get thrown at it to better protect your engine. ATI Super Dampers provide balanced dampening of torsional crankshaft vibrations through all RPM ranges especially during competition use.

ATI Performance Products, Inc. is located in Baltimore, MD, and specializes in producing and maintaining high performance products for street and strip applications. Over the years ATI has earned a reputation for its cutting edge technology, attention to detail, and rigorous testing under race conditions.