These headstuds require you to have your block machined, your head machined, and a custom headgasket.
This is not meant for someone going under 1,000HP but for those looking to push the limits of the platform. The ½" stud will require machining the block to accept the new stud. This has to be done carefully so you do not crack or damage the block. In addition, the dowl hole will need to be opened up and a custom dowl purchased or made (available at Future Motorsports). The head also needs to be machined to accept the wider stud as well as the head gasket. This combination, after machine work is completed, is the one of the best combination for holding horsepower on a cast iron 2JZ block.

Custom head gasket & dowel pins will be required (Sold Separately).