PAC Racing PAC-1238X-16 1.274 Dual Valve Springs Set for GM LS1. 274 Dual Valve Springs (16) GM LS Valve Spring RPM Series Dual Spring 600 lb in Spring Rate 0. 985 in Coil Bind 1. 274 in OD GM LS Series Set of 16

* Weatherproof

2008-2009 GMC Sierra 1500 SL GAS Crew Cab Pickup

25mm CB Matte Titanium Wheel

Intake Manifold - Single-Plane - Square Bore - Single Plane - Aluminum - Natural - Small Block Chevy - Kit

111 LSA (RPM Range 1200-6000)

3L 262 Head SET

Duration: 218/234

All NX components and systems must be tested and proven before they are shipped to any customers

The included magnetic installation tool allows for one-handed installation

Adds 64+ Horsepower 27 ft/lbs

3 Bolt Pattern 72

Enkei T6S 17x8 35mm Offset 5x114