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Power Strokes
7.3 Aftermarket
valve shims
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[QUOTE="oneturboforme, post: 1089535, member: 2627"] Think it's all comes down to trial and error and a lot of these guys are putting so much time to see what combos work the best. Like swamps or irate just to name some. Have there comp. springs I mean if they spent hundreds of hours and thousands of dollars why would they come out and say o you can use comp valve number xxxx. I know there is some math to seat pressures need that take in count boost times area of the valves. But then again that's usually for a Gas engine spinning 8k for rpms. Spring rates and everything else falls into play. [/QUOTE]
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