head gaskets

[Programmer]

It's a bigger problem with the OHC heads...cam bore distortion gets
pretty bad with a re-torque after machining beyond the spec. We
just chuck 'em...it's not worth a comeback.
Lyndon.
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: November 13, 2000 9:57 PM
Subject: Re: head gaskets


>
>This sound primitive.
>I have a 2" wide 24" long file.
>If a head fails the flatness with a straight edge I use the file.
>Sometimes is just almost accidential they fail the straight edge test.
>Other then the OHC stuff I've fudged things without dire results, on my own
>stuff.
>bruce
>
>
>
>----- Original Message -----
>From: "Programmer" <nwester at eidnet.org>
>To: <gmecm at diy-efi.org>
>Sent: Sunday, November 12, 2000 5:44 PM
>Subject: Re: head gaskets
>
>
>> .005" ?? I'd only settle for .000"
>>  Nowdays, .006 can be the
>> warp discard of the head...
>>
>> Lyndon.
>> -----Original Message-----
>> From: John_Calabrese at ENGELHARD.COM <John_Calabrese at ENGELHARD.COM>
>> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> Date: November 10, 2000 7:47 AM
>> Subject: Re: head gaskets
>>
>>
>> >I would have the surfaces not only checked for straightness, but
>> >refinished, maybe even the block as well,  The surface should have a max
>> >.005" distortion to it, and a proper finish (120 rms?)  for good head
>> >gasket sealing.  Putting it back together and just cleaning surfaces
>really
>> >isn't that god of an idea
>> >
>> >Just my.02
>> >
>> >
>> >
>> >John L. Calabrese
>> >Research Engineer
>> >Environmental Technologies Group
>> >Engelhard Corporation
>> >
>>
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>
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