head gaskets

[Len Sabatine]

    Many "Bent " OHC head castings are successfully repaired by shimming @
    high spot on a torque plate , torque them to spec , then relaxing them 
in an
    oven. OHC castings must be straightened in this manner prior to resurfacing
    or for sure , the cam won't turn. These heads don't  make good boat 
anchors.
    Len

>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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