Four Piece Cylinder Head Dowel Alignment Pin Set in Steel 0.625 Inch OD and 0.500 Inch Height Ready To Install Direct Replacement for Gen 3 4 5 GM LS LT Engines LS1 LS3 LS2 LT1 LT4 and LS Swap Engine Rebuild

Four-Piece Cylinder Head Dowel Pin Set for GM LS/LT Engines
✔️ 0.625 in OD (15.9 mm) x 0.500 in height, 4-pack for LS/LT engines

This precision steel dowel pin set is designed to align the cylinder head to the engine block on Gen 3-5 GM LS/LT V8 engines. It’s ideal for LS swap projects, engine rebuilds, cylinder head replacements, and head gasket work to ensure accurate alignment and sealing.

✅ 4-piece steel dowel pin set with rust-resistant finish for direct GM replacement
✅ 0.625 in OD (15.9 mm) and 0.500 in height (12.7 mm), fits Gen 3-5 blocks
✅ Replaces GM pin numbers 551275, 12570326, 12558081; covers two cylinder heads
✅ Compatible with LS/LT engines (LS1, LS2, LS3, LT1, LT4, etc.) and LSx variants
✅ Requires clean holes and light lubrication before install to avoid damage

💡 What is a cylinder head dowel alignment pin set used for in engine builds?

A handy part that ensures precise alignment of the cylinder head to the engine block, which helps seal the head gasket and prevent leaks. - Handy for LS swap projects and engine rebuilds to keep alignment tight - Keeps combustion chamber positioning correct to improve efficiency - Durable steel with rust-resistant finish for long life; direct GM replacement