Review on ARP 247-4202 Stud Kit: Boost Performance and Reliability by Paul Haswood

ARP is second to none when it comes to fasteners. They worked great on my Cummins 6.7. Installation is a small job. Plan to adjust the rocker arms if you're replacing a screw with a bolt, as you'll have to disassemble them anyway. It lasted about 5 hours including occasional breaks to rest and eat. I also replaced the rocker arm seal with a new one. If you are a non-commercial Cummins owner (Dodge Ram etc) you can register at https://quickserve.cummins.com and find all the engine information you need. To register you only need the serial number from the engine plate.