head gaskets

[Len Sabatine]

   Ok then ,very small Boat. Alum Head thermal straightening usually
   will only require bout .005 to cleanup and the cam[s] turns WO/ Bind.
  This method also retains Valve Stem  Indexing .
   We utilize a 2" iron plate and  Bayco cleaning Oven. Works well .
   Len
>Depends on the boat <BG>. I've never run into
>anyone who does that up here...sounds like it'd work.
>Lyndon.
>-----Original Message-----
>From: Len Sabatine <sabatine at epix.net>
>To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>Date: November 14, 2000 7:19 PM
>Subject: Re: head gaskets
>
>
> >    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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