Valve Guide Reamers Star SU valve guide reamers utilize pressurized coolant to force chips ahead of the tool to produce ultra-smooth, ultraprecise holes. They produce holes to tolerance of 0.0005? (0.013 mm) and less in steel, cast iron, compacted graphite iron, nodular iron, aluminum, bronze and exotic materials. Standard reamers manufactured for aircraft valve guides are designed to perfect the guide hole size when reaming new guides. The standard reamer pilot is sized to fit the small bore of a new unfinished guide to insure stability and a straight finished bore. The reamer corrects the bore size. A valve guide knurler looks like an irregular tap about an inch long with a smooth guide shaft on either end. Kind of like a core drill with a tap instead of flutes. Thanks, Jim. 06-05-2011, 09:47 AM #5. Grind. Home > Valve Guide Tools > Valve Guide Finish Reamers > Valve Guide Reamers - Bronze Guides Bronze Valve Guide Finish Reamer. High quality reamers that are specially fluted, heat-treated and ground for improved cutting geometry. These reamers have been specifically designed for KPMI® Manganese Bronze and Cast Iron valve guides. Do not attempt to use these reamers to size C630 Nickel Aluminum Bronze guides. Also, once a reamer is used on Cast Iron, it is not advisable to then use it on a bronze guide. Core Drills & Reamers Core Drill and Reamers used to bore out old "cast in head" valve guides to accept new press in valve guides. Core Drills and Reamers in many sizes (Standard and Specialty) that will fit a variety of Seat and Guide machines. These AV&V long-pilot carbide reamers are designed to quickly finish-size guides when using AV&V Manganese bronze guides (not for cast iron guides) and AV&V valves - no honing required! 1 x #715-610 AV&V 6.0mm Valve Guide Reamer for V-Rod 6mm valve guides & valves + $299.00 A complete supply of Adjustable Valve Guide Reamers With Extension Shanks .250, 1/4, 6.3 mm to .469 15/32