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Complete 12-point head bolt installation walkthrough for 2003-and-earlier Chevrolet Gen III LS engines — 11mm 25/50/75 and 8mm 30 ft-lb torque specs, washer chamfer orientation, and the XP988 vs XP987 vs XP981 fitment check.

Complete head bolt installation walkthrough for 2003-and-earlier Chevrolet Gen III LS engines (hex) — 11mm 30/55/80 and 8mm 25 ft-lb torque specs, washer orientation, and the XP987 vs XP981 model-year check.

Complete head bolt installation walkthrough for the 1963–2001 Ford Small Block 289/302 — 25/50/80 torque stages, washer orientation, thread prep, and the bolts-vs-studs choice.

Complete head bolt installation walkthrough for 1965–1990 Chevrolet Big Block 396/402/427/454 (12-point) — 25/45/70 torque stages, washer orientation, and the XP984 vs XP980 fitment check.

Complete head bolt installation walkthrough for 2004+ Chevrolet Gen III/IV LS engines — 11mm 30/55/80 and 8mm 25 ft-lb torque specs, the same-length bolt check, and washer orientation.

Complete head bolt installation walkthrough for the 1965–1990 Chevrolet Big Block Mark IV with aftermarket heads — 23/46/70 torque stages, washer orientation, and head fitment check.