Part #: OUT - ENG - HEADSTUDS. Outfront Motorsports has joined forces with ARP to create an exclusive head stud kit designed to our unique specs and innovative design. Look for our special markings and avoid imitations. Fitment includes 2002 - 2018 WRX, 2004 - 2021 STI, 2005 - 2009 Legacy GT / Outback XT, 2010 - 2012 Legacy GT, 2004 - 2013 Forester XT, 2003 - 2006 Baja Turbo, 2013 - 2017 BRZ, and 2013 - 2016 FR - S. Benefits: 25% stronger than 625+ studs and 40% stronger than 11mm ARP 2000's. It has a reduced shank diameter, so no head gasket modification is needed. It offers more thread engagement in the block than 11mm studs. It uses stock alignment pins without modifying the case or heads. It has been tested for over 200ft/lbs of stud 'pull - out' in the block. It's priced the same as 625+ kits, but without the need for additional block and head machining. It comes with custom large - diameter hardened washers to prevent embedding into the head under high torque and HP. Note: Block machining must be done on bare cases, not after the shortblock is assembled.
Using this Outfront Motorsports ARP head stud kit is straightforward. First, make sure your engine block is a bare case as block machining needs to be done at this stage. Once the machining is complete, you can install the head studs. The kit uses stock alignment pins, so you don't have to modify the case or heads. The reduced shank diameter means you won't have to modify the head gasket either. When tightening the studs, be aware that they are very strong and have been tested for over 200ft/lbs of 'pull - out' in the block. The custom large - diameter hardened washers are there to protect the head under heavy torque and high horsepower. For maintenance, regularly check the tightness of the studs, especially after high - performance use. If you notice any signs of loosening or damage, it's best to replace the studs right away. Remember, this kit offers great strength and performance, but proper installation and maintenance are key to getting the most out of it.
