Holden V8 253, 304, 308, 355 Welsh Plug Kit Brass Material

Holden V8 engines in the 253, 304, 308, and 355 families demand a reliable seal for core holes. The Aeroflow Performance Welsh Plug Kit in Brass Material is purpose-built for these blocks, delivering durable brass plugs paired with steel oil gallery plugs to help prevent leaks and defend against coolant pressure-induced cracks during operation and rebuilds.

What's included

• 10 x 5/8" (16mm) Outside Diameter
• 1 x 1-53/64" (46.7mm) Outside Diameter
• 3 x 1-5/8" (15.8mm) Outside Diameter
• 1 x 7/32" Steel Plugs

These are complete engine block freeze plug kits and include brass Welsh plugs and steel oil gallery plugs. Cylinder head plugs are not included.

Why this kit matters

Welsh plugs seal core holes to prevent leaks of coolant and other fluids, protecting against cracks caused by the pressure of frozen coolant, while maintaining containment during regular operation. Brass construction provides solid corrosion resistance and a dependable seal, complemented by steel oil gallery plugs for added rigidity where oil passages require protection.

Designed for your Holden V8 rebuild

Each kit is specifically designed to suit each make and model with all correct sizes included for when you are rebuilding your engine. This kit is tailored for Holden V8s in the 253, 304, 308, and 355 range, ensuring a precise fit for a confident, efficient assembly.

Ideal use cases

• Engine rebuilds or remanufactures of Holden V8 253/304/308/355
• Preventative maintenance to replace aging or corroded core plugs
• Restoring coolant containment and preventing leaks in classic or performance builds