Engine & Performance Warehouse VG5604 Oversize Heavy-Duty Intake Valve Guide +.004" OD

The Engine & Performance Warehouse VG5604 is an oversize heavy-duty intake valve guide designed as a precision replacement for Harley-Davidson Big Twin and Sportster engines. With a +.004" oversize outside diameter (OD = .5665"), this guide is engineered for use during cylinder head rebuilds where standard guides have worn beyond serviceable limits.

Key Features:

• Material: Manganese-bronze construction for superior wear resistance and thermal conductivity
• Oversize OD: +.004" outside diameter (.5665") for tight press-fit into worn guide bores
• Unfinished ID: .3090" ID — requires finish reaming after installation (reamer AV-VGRC-3120 recommended)
• High-lift compatible: .050" shorter seal area accommodates high-lift camshaft applications
• Optimized airflow: Profiled guide body designed for improved port airflow
• High-temp sealing: Viton o-ring seal for reliable performance under high heat conditions; use with .530" Viton valve seals (AV-V312530)
• Smooth lead-in: Precision lead-in chamfer for easier valve installation
• CNC machined: Consistent tolerances for repeatable, professional results

This valve guide is an essential component for any serious engine rebuild or head refresh on applicable Harley-Davidson powerplants. The unfinished bore allows the installer to ream to the exact valve stem diameter for a perfect fit. Pair with the recommended reamer and Viton valve seals for a complete professional-grade valve guide service.