The inside of the guides area knurled (kanoodled?).....they got them damn grooves machined in them to trap oil!! In the event the guide has to be replaced, the head casting must be heated up in order to "properly" remove and reinstall the new guide. Tolerances must be checked for clearance and of course the seat must be fitted to accept the valve and have it seal while maintaining spring height etc.

Lots of room to mess up when dealing with the valve guides. Last thing you want is to have to buy a new casting because you cracked yours using the "8lb. Hammer"! Unless of course you have the $$ in your budget- and if thats the case...say screw it and just pick up one of EBs assembled ready to bolt on Street RV heads like I do. <img src="/forums/images/graemlins/smile.gif" alt="" />

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />