PAC Racing Valve Spring Shim Kit - 1.250" OD - 0.575" ID - Steel H764C34XXL Isky Hydraulic Series offers a

Isky Hydraulic Series offers a wide selection of profiles to adhere to a variety track rules

Chevrolet: Cheyenne 07 - 14 5

True Roller

2005-2016 Ford F-350 Super Duty

The ZK-40 was designed for use in races where a CIK-FIA approval was not required

PAC Racing Valve Spring Shim Kit - 1.250" OD - 0.575" ID - Steel H764C34XXL Isky Hydraulic Series offers aProduct Description: Valve Spring Shim 0. 015 0. 020 0. 030 0. 050 in Thick 1. 250 in OD 0. 570 in ID Steel PAC Racing Springs is part of the Race Winning Brands Family. With more than 100 years of spring manufacturing experience. We understand the demands of racing and provide a commitment to all of our customers to provide the best service possible. We continue to expand products and offer expanded onsite technical services at various racing events.