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Old 10-11-2007, 11:16 AM
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Welding Aluminum Cyl Heads

In repairing heavily damaged aluminum cyl heads that are heavily damaged around the valve seats, what process is required to repair them? The original material is 356T. Does welding reduce the area around the seat become SO [soft]? Does it require special rod? If the material is SO will it hold a seat? Will the head require normalizing/reheat treating afterward? Any info appreciated. Thanks, Ed Farrell

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Old 10-11-2007, 02:20 PM
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A gypsy from Bonsall? Ya have to have lived there long enough to know.

Yes use 4145 filler, rough machine for seat, knock out all the other seats and guides, heat treat at 980 990 degrees F, cool slow, finish machine the seat pockets, press in new seats and guides, you might need to kiss the gasket sides with a mill to get it flat enough to keep water and compression in. Probably a lot more expensive than replacing the heads unless these are some old restoration that can't be had over the counter from Edlebrock or some similar source. San Diego's complement of aerospace shops should be able to accomplish this.

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