We are proud to offer the highest quality, longest lasting valve springs for your K-Series engine...Period. Valve control is one of the most important parts of making power and promoting long engine life. Too often springs are pushed beyond their functional limits and valves bounce out of control. We put these kits together after extensive testing and these are a must if you are racing competitvely, turning high rpm, and running huge camshafts. You can spend the money now and have a good spring that maintains valve control and lasts several race seasons, or buy cheap now and replace them a couple times a year...along with the other damage caused by out of control valves. We can also machine the seats to fine tune a pressure setting to suit your specific setup.
Endurance Spring 4PR-SPR-1000K
This spring is a more affordable alternative to our IRL spring kit. It is still Made in the USA and is a little lighter on spring pressure. It does not have the Max Life treatment, but is a very high quality spring and a great alternative to the "budget" springs that are on the market. Max RPM 9,500.
Drag Race Spring 4PR-SPR-1001K
We developed this single spring kit starting with a PSI Pro Stock Motorcycle spring with Max Life Treatment and our own custom seat and retainer. This is a lightweight package with plenty of room to run large camshafts beyond .650 lift. 132lbs on the seat, 320lbs @ .600. Package comes with springs, spring seats, and titanium retainers. Serious drag racing use ONLY. Max RPM 11,000+.
IRL Endurance Spring 4PR-SPR-1002K
This spring kit came about because we were sick and tired of premature valve wear and excessive valve bounce in our own engines. This spring saved us time and money and still to this day that spring is in my #1 engine. This kit utilizes a PSI Chevy Indy Car spring with Max Life Treatment and our own seat and retainer. It is suitable for drag racing, road racing, and a MUST for midget motors. Package comes with springs, spring seats, and titanium retainers. Max RPM 11,000.
MADE IN THE USA!
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