Speedmaster 4.290" Bore Piston Oil Ring Rail Spacer Support 0.030" Thick Set of 8 PCE308.1005

The Speedmaster PCE308.1005 is a set of 8 piston oil ring rail spacer supports engineered for engine rebuilds and performance applications requiring precise ring rail control. Designed for 4.290" bore applications, these 0.030" thick spacer supports maintain proper oil ring tension and positioning within the piston groove, critical for effective oil control and engine sealing during high-rpm operation.

These precision components are essential when rebuilding or refreshing high-performance and racing engines where exact ring gap and rail support specifications are required. The set of 8 allows for a full complement of pistons in V8 engines or mixed rebuilds. Machined to Speedmaster's OEM-equivalent tolerances, these spacer supports ensure consistent oil ring performance, reducing blow-by and extending engine life in demanding conditions.

Key Features & Benefits

• Set of 8 Units: Complete set provides spacer supports for a full V8 engine rebuild or piston refresh project.
• 4.290" Bore Specification: Engineered specifically for 4.290 inch bore piston applications.
• 0.030" Thickness: Precision 0.030 inch thickness maintains correct oil ring rail support and tension.
• Oil Ring Rail Control: Designed to properly position and support oil ring rails within the piston groove for optimal sealing.
• Engine Rebuild Grade: Manufactured to precision tolerances required for high-performance and racing engine applications.

Specifications

Ideal Applications

• V8 engine rebuilds and refreshes
• High-performance racing engine assembly
• Piston ring gap and tension management
• Engine restoration and reconditioning