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Message: [QUOTE="sideactiondiesel, post: 1442775, member: 5070"] We see failure from 90k -220k .... It comes down to maintenance and quality of oil used through its life cycle. But we have also had new Ford shortblocks have failures within 1000-10k miles.. so things can wear...Valvetrain gemotry....Valve spring installed height coil bind and other things all play a factor. But my other opinion on the subject is spring pressure.. if you have a weak spring at higher rpm it can cause an unbalanced hammering affect on the roller of the tappet and cam lobe... A lot of things play a part in helping these lil bastards want to throw In the towel. Just my 02 [/QUOTE]

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