[Jeff Chambers]

Higher pressure springs, when used without hardened shims or spring cups, will tend to dig into the head and create metal shavings/particles....not good floating around in the engine. Double & triple springs do this even a little more. Comp Cams makes both hardened washers and spring cups. Spring cups are used alot on aluminum heads and washers are used on both aluminum & iron for shimming the spring to the proper seat/lift pressures. The doubles do take a different retainer, but the steel retainers for these springs are only about $39 from Comp and are 10^ locked. Your shop should be able to tell you what seal will work with the ID of the spring.

Good springs are a necessity no matter where you normally shift or trap your car. You never know when you'll miss that shift and rev the motor higher than expected. Plus its amazing how much fresh springs will wake up a motor. They are absolutely the cheapest preventative maintenance that you can do for your motor.

I'm a fan of double springs since there's a backup in case on of the primary springs ever break; the valve won't immediately drop into the cylinder and wreak havoc on my precious motor.