Texas Speed's .750" spring kit featuring PAC Racing 1209X RPM-series valve springs with a max valve lift rating of .750"!  This is an excellent setup for any customer running aggressive lift with their hydraulic roller camshaft, as well as those running factory GM rocker arms with a low-lash solid roller camshaft!  
PAC does recommend a quality aftermarket set of lifters with these valve springs.  OE lifters are not recommended.  
Excellent choice for those spinning 7,000+ RPM, endurance racing, and/or running 25+ psi of boost in their supercharged or turbocharged application.

Kit includes the following: Spring Seats, Valve Seals, PAC 1209X Dual Springs, and Titanium Retainers (utilizes GM factory valve stem locks, not included)


Specs:
 
Install Height:   1.800"
Closed Spring Pressure: 160 lb. @ 1.800" Installed Height
Open Spring Pressure:  510 lb. @ 1.100" Height (.700" Lift)
Maximum Spring Lift: .750"
Coil Bind 1.000"