KPMI Valve Guide - IN / EX +0.001 Cast Iron HD Evolution 1987-1999 — Harley-Davidson (1984-2004)

KPMI valve guide for Harley Evolution engines, cast iron construction sized at +0.001 in for intake and exhaust ports. Machined to factory specifications as a direct replacement for 1987-1999 HD V-twins.

Features

• Cast iron construction
• Fits intake and exhaust ports
• Oversized +0.001 in
• Machined to factory specifications

Specifications

• Brand: KPMI
• Manufacturer Part #: 20-4321C
• Material: Cast iron
• Oversizing: +0.001 in
• Length: 1.65 in
• Weight: 0.04 lbs

Fitment

Fits Harley-Davidson Evolution engines, 1987 through 1999 model years.

Frequently Asked Questions

What does +0.001 in oversizing mean?

The guide is machined 0.001 in larger than stock to accommodate rebored or worn valve stem holes, restoring proper clearance.

Can I use this on both intake and exhaust valves?

Yes — this single part number fits both intake and exhaust ports on Evolution engines.

Will this fit my Twin Cam or Milwaukee-Eight?

No — this guide is specific to Evolution engines (1987-1999). Twin Cam and M8 engines require different part numbers.

Do I need to hone the port after installation?

Yes — proper installation requires reaming or honing the port to final size for correct valve stem clearance. Have a machine shop install this guide.