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Power Strokes
7.3 Aftermarket
Aftermarket valve spring discussion
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[QUOTE="Cota, post: 199351, member: 320"] Stock springs, 38r and 238/80 hybrids equaled bent push rods, broken rocker towers, hydrolocked cylinder and blown head gasket all on cylinder #1. Now running 4294r, 250/100's non shimmed 910's, pushing 52lbs of boost, about 65 back pressure with no problems so far. New motor will have the Hypermax high rev valve spring setup. [/QUOTE]
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