[6pack] Head studs

[Navarrette, Vance]

 	Stan:

	Studs are installed finger tight only. Put the head on, then the
nut and torque as specified in Bentley. The big advantage of studs is
that the threads in the block are preserved because there is no axial
friction as the nut is tightened. Turns out that the axial friction
generated as a screw is tightened plays a major role in degrading the
strength of the threads. Think about aluminum, after tightening
something a couple of times, the threads will pull out - same thing
happens in iron, it just takes a little longer.

	Vance


    Vance Navarrette
    Cogito Ergo Zoom
    I think, therefore I go fast

-----Original Message-----
From: 6pack-bounces+vance.navarrette=intel.com at autox.team.net
[mailto:6pack-bounces+vance.navarrette=intel.com at autox.team.net] On
Behalf Of Foster, Stan
Sent: Sunday, April 13, 2008 7:11 PM
To: 6pack at autox.team.net
Subject: [6pack] Head studs

Hi fellow 6packers. I wonder, do head studs need to be torqued to a
specific
lb/ft into the block before installing the head or do they need to be
merely
tightened until all of the thread has been consumed by the block and the
stud
is no longer willing to rotate ?

Stan