TSP GEN 5 .660" Lift Dual Valve Spring Kit - LT4 ONLYThe all new TSP . 660" Gen 5 2014+ LT4 . 660" spring kit featuring PAC valve springs is the newest offering in valve spring technology offering the latest processes and material for maximum spring life. PAC Racing is a leader in valve spring technology, so it was only natural to team up with the best in the valve spring industry for TSP's latest offering in a valve spring kit! TSP has developed a . 660" dual spring kit with the help of PAC Racing that

660" dual valve springs

low friction nylon

Includes O-Rings for oil pickup tube assembly

such as a master nitrous switch or an electric water pump

Typical gains are 20-25 RWHP depending on tuning

but a very reasonable RPM range (3

Note: ONLY fits the dished 3-Lug LS-style flexplate unless optioned with Billet Front Cover

110 or 114 LSAs are available by request

Part Number 25-1051 Part Type X-Pipe Brand Speed Engineering Vehicle 2004-2006 GTO Material Stainless Steel

Full 1 3/4" OR 1 7/8" Primaries

and have shown better valve train stability

"The Truck Norris will deliver a roundhouse kick in the pants to your 1999-2013 Silverado or Sierra