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There is a tolerance specification and it may be within the allowance. Check the manual. Some is expected that's the reason for gaskets. Even for the freshly machined heads that have set on the shelf.
That is not very warped! Especially if it from end to end. .006 might be maximum. Only .003 from the end surfaces, each. I'm just guessing about max.
As long as the machine does not impart any stress from clamping of the head. All of the other stresses should be relieved by now from the repetitive heating. What is there now is all that there should be.
I have wondered, if they can do it with the cam and all in place. I believe they do it with the head face down and the cutter is under it. They call it a broaching mill table. I have never seen all the types of automotive machining equipment per say. They are usually special single purpose machines.
Like brake drum machines. Just hope you don't get a rookie kid that wants to bury the cutter so he can make it in one pass. I hate that on brake turning.
I want the same with my brake disc as long as I get rid of hard spots if I ever get them. Machining as little from it saving as much to keep it as thick as possible so they won't warp again and prolong the repurchase by staying above the minimum thickness.
If I did my own head I would use a regular milling machine I have. Of course its more labor on my part from the way I would have to clamp it lightly with shims. I would indicate it as flat as possible and take as little as possible. Actually leave a witness mark of the prior surface. 90%+ cleanup. That is just my preference.
Then again. Like Jorrell say's, if it has any corrosion pits that could get worse it has to be considered. If the head has a lot of miles. It was probably the gasket that gave up the ghost. It happens even if you keep good coolant but it's quicker if you don't!
Your there now. If its needed, then this is the time?
It would take both to push me harder since I would do it the hard way!
Phil
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