4PCS for LS LT Cylinder Head to Block Dowel Set GM 12570326 LS1 LS2 LS3 4.8 5.3

Cylinder Head to Block Dowel Set for GM

This cylinder head to block dowel set for GM secures precise head gasket and cylinder head alignment, referencing OEM part number 12570326.

Overview

This cylinder head to block dowel set for GM includes four essential alignment pins for V8 engine assembly projects. Designed for precise tolerance fits, this cylinder head to block dowel set for GM is for engine builders who require perfect alignment during top-end assembly. These steel pins ensure the multi-layer steel gaskets stay perfectly positioned on the engine block deck.

Built For Performance

• Hardened steel tubing resists shear and compression forces during head clamping.
• Precision ground outer diameter ensures a snug, shift-free fit in alignment ports.
• Hollow sleeve design allows cylinder head bolts to pass through smoothly.
• Corrosion-resistant treatment protects against moisture lock and rust binding.

Fits These Machines

• for GM LS1 Engines
• for GM LS2 Engines
• for GM LS3 Engines
• for GM 4.8L Engines
• for GM 5.3L Engines
• for GM LT Engines

On-The-Job Use

• Aligning head gaskets properly onto the engine block before bolting.
• Ensuring cylinder heads do not shift laterally under extreme combustion pressures.
• Restoring factory specifications during complete engine block rebuilds.

Specs At A Glance

Good To Know

Q: How many dowel pins are needed to rebuild a complete V8 engine? A: This kit contains four dowel pins, which is the exact amount required to align both cylinder heads on one V8 block.

Q: Are these dowels hollow to let cylinder head bolts pass through? A: Yes, these are hollow alignment sleeve dowels that allow the outer head bolts to be inserted directly through them.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.