I have replaced guide in an aluminum head on a car and on a BMW twin. All I used was a punch that I sized on a lathe and in the car I used an air hammer to push them out and in (warmed the head). On the BMW I used a press. In both cases, I reamed the guide after and then touched up the seats with a nu-way cutter. The car lasted us for 170,000 miles and the Bike got sold about 50,000 miles later (my friend Vann’s bike). Another friend needed guides in his Moto-Guzzi and sent out the heads to a shop that only did heads. It ran for a few miles but the guide came loose and it was not concentric so the valve stopped seating and burned. I think what I am saying is do-it-yourself or send it to someone who really knows the heads and what they are doing.
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Rick
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