It was installed on a 2005 Impala 3.4. The kit included lots of O-rings, rocker cover gaskets and rocker cover bolt gaskets, thermostat gasket, valve gaskets, upper and lower intake gaskets and of course head gaskets. Everything went well. The only problem I had with this kit is that the head gasket doesn't show which side is up. Luckily I found an installation video for a similar product and found that the white trim is the side of the block and the all black side is up. Also included was an extra head screw, which isn't too bad, but it made me think I just tightened the heads and forgot the screw. I'll report back once the car has driven a few miles.