[Roadsters] Cylinder head

[Dave Stoll]

There is a tolerance for how flat the head is.  None are perfectly flat.  If 
the head is curved so that the ends touch the top of the block first, by 
starting torquing the bolts in the middle first you pull the curve down and 
flatten the head. If you were to start tightening the bolts at the end first 
it would be much harder to pull the head down flat in  the middle..we are 
only talking a couple thousandths but thats all it takes to get a leaky head 
gasket..  I believe the tolerance on the 1600 heads is .003 to .005 
thousandths of an inch or about the thickness of a piece of notebook 
paper...
daveS

----- Original Message ----- 
From: "dave" <daveandlindab at comcast.net>
To: "'Bubba'" <bubwin at mts.net>; "'Datsun-Roadsters at Autox. Team.Net'" 
<datsun-roadsters at autox.team.net>
Sent: Wednesday, March 05, 2008 8:36 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