Re: [Amc-list] Torque and re-Torque

[Tom Jennings <tomj@xxxxxxx>]

Bruce, thanks truly for the words of wisdom! Some guy does crappy work, 
then blames the motor... yeah, we've all heard that before!!



-- Bruce Hevner <scramblr@xxxxxxxxxxx> wrote:
> Now I don't have a lot of experience with the particular engine being
> mentioned here. But I DO have a LOT of experience doing all kinds of
> automotive machine work (40 years).
>  Has anyone using one of these motors and having that much trouble had the
> BLOCK machined? In my experience the top of the block will be warped as
> bad or WORSE than the head after you run it hot a couple of times.
>  MOST head gaskets will only "crush" between .003 and .007. MOST of the
> old blocks (no matter the type) I machine have an AVERAGE of .012 taken
> off to get them flat. Sooo,, do the math,, ASSUMING your head is flat and
> you put it together with .012 warp of the block and the gasket only
> crushes .007,,, she aint gonna last long that way.
>  And what kind of finish and accuracy are you getting on your machine job?
> DO NOT let your head get "sanded" on one of the big sanders. I have seen
> more cylinder heads ruined by those things than I can count! I have
> actually measured a cylinder head that was sanded .125 more on one end
> !!!!
>  Spec to your machinist that you want it MACHINED not sanded. I do mine on
> either a Storm Vulcan Blockmaster or I have a jig for my Enco mill that I
> use. The Enco will get a cylinder head 18" long square and flat within
> about .0015, that's DARN close!!
> I can't see where a re-torque of the head periodically can hurt you after
> the initial squeeze is done.
>  What type of gasket is being used? I'll have to tell you I have
> absolutely NO faith in FelPro's non-retorque head gaskets. If it were ME,
> and I knew the history of this motor I would be looking for a Graphite
> head gasket with a silicone release on it, I would NOT use any sealer on
> it.  If your block and head are flat with a reasonably smooth surface you
> should get good service life out of it.
> But HEY,,, that's just ME!!
> Bruce Hevner
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