I heard from people that had good luck with either PSI or PAC, more makes a difference with proper spring for application.
The 1300 series have more work done to them, make them last longer.
If you're not stressing springs much, 1200 series might work just fine.
This is why you need to do your homework before you buy valves and retainers. To me its always better to use a spring afew grades better and install them without killing them so they will last. Installed height is the key to spring life not killing them yet still have surge control and long life. You can,t do that with a short valve and have to be near coil bind to control them. Lift and duration (lobe profile) appropriate.
Springs will always cause debate. Experience will teach you otherwise.
You gotta ask yourself being a cheap ass is not the place for springs, witch can destroy your motor.
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