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Old 07-15-2003, 09:26 PM
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cylinder head repair

Hi to all. While drilling to install hardened exhaust seats in my 487x heads, my machinist got into a water port. Musta been a flaw in the casting because the other 7 were alright. He mixed up some kind of epoxy and filled the small crack, then installed the new seat. He talked like between the epoxy and the new seat installing tight that I would have nothing to worry about. My question is, has anybody out there ever had any experiences like this? Would just go with another set of heads, but have already got these shaved, new guides installed, and drilled and tapped for studs. Hoping to get some feedback on this one way or the other. Thanks.
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Old 07-15-2003, 09:36 PM
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As a long time machinist, I wonder about his judgement. I would pitch the head and get another. Even in the best situations, I've seen seats drop out/come loose and in your case that would mean a cylinder full of water.
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Old 07-16-2003, 07:03 AM
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IMHO, at the least he should pressure test them after the repair.

I don't know that much about epoxy, but in the critical area of the seat, I'm thinking I'd rather have it welded and machined. If you think about the pounding the exhaust seat takes, along with the extreme temps, better have some badazz epoxy down there.

On the other hand, if the head is not something special and a replacement can be found, you might consider that. You may be able to work out a deal with the machinist about the work you already had done to the damaged head. At least a discount on setting up the replacement head.

Good luck.
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Old 07-16-2003, 11:15 AM
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I've seen this type of repair done successfully before, but I would prefer repairing the crack with spray welding then remachining for a new seat which is a better way to fix it. Or, just get another head core.
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Old 07-16-2003, 12:19 PM
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Get a new head, the valve seat on the exhaust side is the hottest part of the head besides the valve itself. I wouldn't trust it, although it may hold for awhile.
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Old 07-16-2003, 02:26 PM
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Hello, thanks to all for the comments. Decided to go with some new Dart Iron Eagle Heads. Yea, I just didn't feel good about the epoxy situation. Had to spend a good piece of change, but piece of mind means alot.
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Old 07-16-2003, 02:56 PM
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Quote:
Originally posted by TIM LIMES
...............but piece of mind means alot.
Words to live by.

Congrats on the new heads.
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