Oversize Intake Valve Guide. Fits Big Twin 1948-1979. +.002in. Outside Diameter

Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains , excellent wear resistance.

* OD = 0.5670" (+0.002" Oversize)

* ID = 0.3745"

* Replaces OEM # 18143-79

Matching Exhaust Guide # KPM-20-2032C

Valve Guide Seal # KPM-71011-4