Be sure that you blast all of the carbon off of the nose of the exhaust guides. If you don't, it will gouge up the guide hole in the head as you drive them out.
You should have a driver with a pilot on it to drive the guides out. If they are oem 900 guides (brass, check with a magnet), drive them out cold. If they are iron 1000 type, heat the head to drive them out.
To install new guides, we have a fixture that holds the head at the correct angel in the press, and we press them in cold using assembly lube. Our guides have a machined ring on them that sets their location in the head.
Pressing the guides in will cause them to tighten up a small amount. We use a Sunnen valve guide hone to open them and size them exactly to the Serdi pilot we will be using for the valve job. Easy to do, but the Sunnen hone is expensive. We sell guide hones that the home shop can use to size guides;
www.aperaceparts.com/tools.html
Good luck.
Jay
Post edited by: APE Jay, at: 2006/05/15 02:48