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No matter what cam you upgrade to it is a good idea to upgrade your springs. It is not always needed as is the case with the hks/gsc setups. However even at that lift I have had shops tell me they have had the valves jumping on the seats when closing. With any more lift applied this situation can happen, affecting performance, and possible damage to your motor. I have installed quite a few hks setups with no problem, however when my cams go in so will upgraded springs. Its cheap insurance.
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