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This is for a set of 12 meaning this is for a 3800 engine or other GM 12 valve systems. You will need to search our other auctions for the set of 16 if you are looking to use on an LS application. These are brand new, but not in retail packaging. They are original GM Performance. Just not in retail packaging. We bought a large quantity in surplus to get the price low to pass on the savings to you. This is below wholesale dealer pricing.
Safely increasing cam lift or maximum engine RPM will require new valve springs. For example on the 3800 we use LS1 "behive" valve springs which means that when running new springs you will also need our LS1 retainers.