| :The suggested springs jwt states def are not suited for 8000rpms. The HD springs are def required and highly suggested over the ones jwt suggests. Incorrect. This cam profile was designed specifically for this spring. The JWT HD spring is NOT recommended with this particular cam because the lobe tip stresses are too high. The springs go into harmonic flutter and will not control the valve past 5500 rpm. And you verified this how? You have a history of NOT testing. :Anytime you go with a solid lifter/cam outfit spring pressure has to increase go control valve action and increased harmonics. Incorrect again. The solid lifter bucket is much lighter than the hydraulic lifter, and requires less spring. I've tested both springs and jwt suggested spring is inferior. Your opinion is incorrect in this application. You are doing your customers a disservice by suggesting this valve spring. Don't always go by manufactures suggestions. Put the book down. Here is a tip: When you don't know the answer, don't guess. Pick up the phone and call someone who knows the answers. For the record: DO NOT use the JWT HD springs with this cam. Doing so may result in premature cam failure due to excessive lope tip stresses.
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