If you're replacing the stock cam with another hydraulic cam & lifters, you need not convert to adjustables.The conversion kit is for using adjustable roller rocker arms or to correct geometry problems stemming from changes to the engine- valve grinds, head or block milling, composite head gaskets to drop compression or other things that change the space-relationship between the cam lobes and the valve stems. There's LOTS of room for improvement in stock heads and all will alter the valve geometry- some to the plus, some to the minus side. You never know unless you check. Perfect adjustment will even make your valve guides last longer.
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