Rated at a tensile strength 190,000 to 200,000 PSI. Material 8740 Chrome moly. U.S. made. These studs eliminate problems associated from head bolt use. Common problems include bolt breakage, block and thread damage, less clamping force and bolt stretch, constant re-torquing of cylinder head, rear oil gallery leakage. Keep that head from moving around. Torque spec. 65 Ft Lbs Moly lube. 80 FT Lbs. Oil.

Please be sure to tap out the block before installing with a 7/16" X 14 tap. These are studs are a free floating fastener so it is not necessary to Lock Tite or bottom out and torque the studs into the block. However, it is important to have as much threaded engagement in the block as possible.

SPECIAL NOTE: Original U20 head bolts were un-heat treated and have a tendency to stretch and or break off in the block. Early head bolt head diameter measures .622. Later, better quality replacements that are no longer available, measure .702. If you have the early head bolts we strongly recommend replacement.

SPECIAL NOTE: All of the head bolts on the passenger side of the block are the same length. It is not necessary to be concerned about the stud length where the, cylinder head, locating dowels are placed. We have found that there is enough, threaded engagement in the block, to allow a proper torque.