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without changing the duration



I've always believed that too. However, there are some on here who will argue that till they're blue in the face.

I still don't think the gains or advantages are worth the expense. It's a hydraulic cam - you can adjust the preload but then what, you'll never need to touch it again! How far off can it be ... factory decks and heads were never accurate! If the motor runs well, leave it alone - it's not a killer!

If you go with the new rockers you'll need pushrods. You should also change the shafts AND will have to fart around with spacers (aluminum rockers don't like getting cozy with cast iron pedestals or the stock hold-downs).

The money'd be better spent on a set of free-flowing mufflers.