Re: Broken valve guides
Duke,
I would use that method and actually do with aluminum heads. Never measured the temp of the head but was careful not to get it to hot.
Took the guide out of the freezer and pressed it in.
I might add for the sake of this post that if the guide is drilled out it needs to be drilled undersized and finished with a piloted reamer to get the proper seal. The heads I am familiar with offer over sized guides, .005, .010, and I think .015.
Joe, as you said in a prior post, it is important to get the new guide exact or the valve will miss the seat in the head.
I cheat and use my mill to keep them true. Can't see drilling a oval hole out free hand and getting it exact. The press out seats make life easy because the hole is round and centered and with a piloted reamer can be done free hand.
I know both you & Duke know that but thought I would add to what you both said.
Dom
Duke,
I would use that method and actually do with aluminum heads. Never measured the temp of the head but was careful not to get it to hot.
Took the guide out of the freezer and pressed it in.
I might add for the sake of this post that if the guide is drilled out it needs to be drilled undersized and finished with a piloted reamer to get the proper seal. The heads I am familiar with offer over sized guides, .005, .010, and I think .015.
Joe, as you said in a prior post, it is important to get the new guide exact or the valve will miss the seat in the head.
I cheat and use my mill to keep them true. Can't see drilling a oval hole out free hand and getting it exact. The press out seats make life easy because the hole is round and centered and with a piloted reamer can be done free hand.
I know both you & Duke know that but thought I would add to what you both said.
Dom
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