| [GMCnet] Re: replacing driver's side head on a 455 [message #364949 is a reply to message #364947] |
Thu, 24 June 2021 10:38   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
|
Senior Member |
|
|
Robert,
Most of us that know engines see no advantage to coat the Al. intake.
Yes Al. Oxidizes more than steel, but you should be more concerned about
sealing the intake to the head as that is where lot of problems develop.
On Thu, Jun 24, 2021 at 8:05 AM Robert J. Gogan
wrote:
> Compression loss was from head gasket web failure between cylinders #5 and
> #7. I believe this was from inadequate torque on the head bolt at that
> location. Found that all the head bolt bores in the block were the same
> depth but on chasing the threads found that the threads did not extend deep
> enough on the bore in the block on the outboard side between #5 and #7.
> Confirmed this by looking down the bore. Dealt with it by putting a Grade
> #8
> thick washer under that head bolt. I could have cut the bolt shorter or
> tapped the hole deeper with an end tap, but this was the simplest solution.
> All the bolts torqued down as expected.
> Now I am dealing with the aluminum intake manifold which is turning out to
> be less than perfect. New post to follow.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
