I'm sure there are people out there smarter than me, but my opinion is as
follows:
It makes no difference how one loosens the head bolts. I am sure that many
heads have proven to be warped after the heads bolts are loosened, and the
head is removed. But, I believe the condition is the result of stresses
induced in the head by improper cooling or other factors, and that it makes
no differences how the "tension" is released. When the head and block are
cool, there is no force I am aware of which could result in warpage, unless
the head is already under differential stress "contained" by the clamping
force of the head bolts.
Gary Ault
----- Original Message -----
From: "dave" <daveandlindab@comcast.net>
To: "'Bubba'" <bubwin@mts.net>; "'Datsun-Roadsters@Autox. Team.Net'"
<datsun-roadsters@autox.team.net>
Sent: Wednesday, March 05, 2008 7:36 PM
Subject: Re: [Roadsters] Cylinder head
>I never heard that before, I didn't think a cold head woul warp from the
> torque being let off unevenly, but I guess it's possible. Not refuting
> it,
> just news to me.
>
> Dave Brisco
>
> -----Original Message-----
> From: Bubba [mailto:bubwin@mts.net]
>
> When loosening the head bolts, start at the front and crack the first two
> head bolts loose, about 1/4 turn, then the back two by the firewall, then
> the second row from the front, then the second last etc. Once they are
> all
> loosened 1/4 turn, loosen then another couple turns. Tap on the side of
> the
>
> head with a rubber mallet or dead blow hammer, or jiggle the manifolds
> until
>
> the head pops loose. Then remove the bolts and head. Basically the
> reverse
>
> of installation.
>
> This minimizes any chance of warpage.
>
> Bob Winslade
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