Thread: Valve guide repair

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you need to guild the core drill when drilling when you go from 11/32 to 500 or you will have much seat run off so like i said you need a seat and guide machine or a upt that holds each guide to the seat square. then you run the core drill thru the fixture .any machine tools are very pricey you will have more in to this then you think. you need reams 342.343. small brm hone guide cutter . guide driver and you need a gear box that slows the reams it a slower speed and more tq you could try to do this on a mill like a bridgeport but you need away to hold the head to the mill table and guide needs to be dead on or you will have to much seat to guide runout .i do not knurl i run a soild guides i use mang bronze guides . and when your done you need to do a valve job to true up the seats so there is no run out . i buy from goodson all the time if you find any reams or tools that are made for auto machining for 1/2 price of goodson new let me know