Brand New Heavy Duty Head Stud Kit. Honda 400EX & 400X Years 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015. 8470 chromoly case hardened studs. Allen heads for easy install and removal.12 point chromoly head nuts. Increased torque to 65 foot pounds. No drilling or tapping required, meaning cost wise this kit is about the same as other kits that seem less expensive. This is a bolt on kit with no machining required. The item "Honda TRX400EX TRX 400EX KMS ARP Stronger Heavy Duty Cylinder Head Studs Kit" is in sale since Tuesday, March 31, 2015. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "azquadparts" and is located in Gilbert, Arizona. This item can be shipped worldwide.