Tacoma Main Studs Part Application: 1013108 - Tacoma Main Studs Part (Back to Instructions) (Purchase Products) sure to check thread pitch to make sure correct end goes into block (Allen head up). Use 12mm x 1.25 tap to clean threads in the block. Make sure each stud threads into block all the way. Install main studs in block with 3/16 Allen wrench. Hand tight. Do not torque. Install main caps on studs. Install washers and nuts on studs, torque nuts to 70ft lbs using molly lube or 85ft lbs using 30wt motor oil. Call our Tech Line in you have any questions on installation. 928-505-2501 (Back to Top) (Back to Instructions) (Purchase Products)