Patriot Performance's Xtreme spring evolved from their Orginal Patriot Gold. The Xtreme spring is for power adder applications, heads using large valves, and for aggressive cam profiles.
These complete spring consists of 16 Patriot Gold dual springs, 16 titanium retainers, 32 Super 7 Machined locks, 16 .505" ID machined spring bases, and 16 viton rubber seals. This kit will work with both stock and aftermarket rocker arms. No cutting or machining of the stock spring pocket is needed.

*1 kit required per pair of heads.

Technical Specs:

Install Height: 1.800"
Max. Valve Spring Lift: 0.660"
Spring Pressure Closed: 155 lbs. @ 1.800"
Spring Pressure Open: 410 lbs. @ 1.140"
Coil Bind: 1.090"
Retainer Material: Titanium