Cayman S 3.4L to 3.8L Engine Conversion987 100 921 99 2006 2008 Cayman S 3. 4 to 3. 8 engine New sleeves, new CP pistons Full rebuilt engine and heads Ground up rebuild including all major components: mains, rods, chains, rails, tensioners, fuel injectors, water pump, pistons, sleeves, rings. Can use your existing good core, or one straight off our shelves with no waiting or down time. allow 4 6 Months build time, none on the shelf need your core sent in