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Cylinder head flatness
Thread Starter
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Cylinder head flatness
What is the spec on cylinder head warpage that you guys use? How much is too much? I have measured .005 warpage at a diagonal on the head. If that is too much what are the options out there for new heads. Stock? Fireringed?
Fleet Owner
Joined: Nov 2003
Posts: 27,888
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tjbeggs -
As I re-read your thread, you may be checking the flatness incorrectly. I will send you a pm w/ a link to a video - it may help (its been awhile since I looked at it).
As I re-read your thread, you may be checking the flatness incorrectly. I will send you a pm w/ a link to a video - it may help (its been awhile since I looked at it).
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Fleet Owner
Joined: Nov 2003
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Geat post Cartmanea - just rewatched the video. Ford states that you should not even check it on the diagonal - just across the bridges as you state.
Thread Starter
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Thanks for the help guys! Gotta get this one done by tomorrow afternoon as the customer has an appointment at BTS on Friday!
Elder User
Joined: Aug 2007
Posts: 516
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From: Milwaukie, Oregon
carefull on the machining. if you get a come back say it has blown gaskets again due to the smaller combustion chamber. you had no choice. machining a head has the same effects as a chip. more boost because of a smaller chamber. id go with new heads if you dont want a cranky customer. well if you think about it... they will be cranky either way because the new heads are spendy and the old machined ones might cause a gasket blow again. anyways good luck. something to think about.
Super Moderator
Joined: Jul 2004
Posts: 21,113
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From: Ohio
Blown gaskets are a result of the head bolts stretching or bolts that turned right out in your hand because they were never torqued at the factory. My heads were twisted and bowed, so we machined both heads and installed studs.
I can truly tell you if any machined head were going to blow again I would have already done it. I see no one mention they checked the block, you should also consider this when doing the repair.
I can truly tell you if any machined head were going to blow again I would have already done it. I see no one mention they checked the block, you should also consider this when doing the repair.