Kibblewhite Ampco-45 Intake/Exhaust Valve Guide For Harley BT Features Precision-machined from Ampco-45 Compatible with no-lead fuel and accept any type of valve-stem material Provide maximum service with chromed valve stems Overall length is 2.40 OEM Style Machined for standard .420 seal and can be used as an intake or exhaust guide Guide OD .5720 Guide ID .3090