Installation Method For SUB14 Head Stud Kits
Replaces: Subaru part 11095AA042
Application: Subaru EJ20/22/25 boxer engine
Included: 12x 14mm Studs, 12x Washers, 12x Nuts and assembly lubricant
- Before installing 14mm head studs, it's essential to perform drilling and tapping on the existing 11mm holes in the engine block and cylinder head to accommodate the larger studs. Contact HCR to order this service or ask your local machinist for help
- Begin by lubricating the block end threads of the studs with engine oil.
- Insert the studs into the block and tighten them to approximately 10Nm, which is hand tight using a 5mm Allen wrench. If you encounter any resistance, stop immediately. Back out the stud and inspect the threads on both the stud and the block. Use a Thread Chaser as needed to carefully clean and refine the threads if tightening by hand is not smooth and easy.
- Verify the height of each stud relative to the others. If installed correctly, all studs should be within +/- 0.3mm of each other in height.
- Install the head gasket and position the cylinder head, install washers ensuring that both the washer surfaces and the cylinder head surface are completely degreased.
- Before final tightening, apply ARP Ultra-Torque fastener assembly lubricant to the stud threads and nut flanges. Do not apply lubricant on washers and head surface. Proceed to install the nuts onto the studs, tightening them by hand until snug.
- HCR strongly recommends the use of ARP Ultra-Torque fastener assembly lubricant over alternative lubricants like motor oil. This preference ensures reduced friction on the studs and consistent clamping force, guaranteeing optimal fastener integrity and reliability.
TORQUE PROCEDURETighten the bolts sequentially as shown in bolt torque sequence diagram.
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Bolt torque sequence  
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