Quote:
Originally Posted by eschaider
If your application is particularly tough on the valve springs, some of the firms like PAC wil offer a nitriding option. The nitrding does not significantly change the spring rate but it does significantly improve fatigue life and operating life. You might want to investigate that as you go about selecting your replacements.
Ed
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Agreed. The original engine assembler installed the PAC 1200 series springs. When the failure occurred, I replaced them with the 1500 series.
Added for clarity. Scroll down to page 12.
https://www.racingsprings.com/media/...er-Catalog.pdf