Guide Exhaust .005 Bronze Jaguar 3.4,3.8,4.2

This a is a Manganese Silicon Bronze Exhaust Valve Guide with an OD of .0506 which is +.005 larger than stock for heads than have been worn.  Will be correct for Jaguar XKE 1961 to 1971 (6-Cylinder), XJ6 1969 to 1987. Why choose a Manganese Silicon Bronze Valve guide? Bronze has the amazing ability to self lubricate plus the Bronze provides superior heat transfer and resists seizing compared to standard Cast Iron Valve Guides. Rebuild your Cylinder Head once with High Quality Manganese Bronze Valve Guide.