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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 648965, member: 8143"] Problem is that with higher lift and more duration, you inherently have less valve to piston clearance. Throw in milled heads, milled block or both its even closer. Go to the strip, sled pull or do a burnout and break a u-joint, input shaft or something else you end up with an over rev. Even with better springs and pushrods I have still seen these hit. Mainly on the exhaust valves. Valve reliefs are good insurance and do not make any bit of difference on anything else. The pistons I have even in full competition trim; standard bore, valve reliefs and straight wall bowl still is 17:1. And for really most climates is totally fine on a common-rail engine. My question to most is, if you are doing pistons why not add valve reliefs? Unless its a bone stock rebuild with no future plans of ever doing anything performance to it. Just my $0.02 [/QUOTE]

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