| [GMCnet] Blown Exhaust Gasket [message #73976] |
Mon, 15 February 2010 22:12  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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I've had very good luck using copper exhaust gaskets on 455's. That's why I
was so surprised when I removed the headers from the 455 before removing the
drivetrain. At the top center of the right exhaust manifold there was a
break in the gasket. The conventional wisdom is that one should not tighten
the top center bolts very much to prevent rocking the manifold toward the
top, loosening the bottom, and allowing leakage. That's more commonly said
about iron manifolds than about headers, but is nonetheless what's
recommended. In this case, the top bolt was VERY tight (don't ask me why !)
-- in fact, it was so tight that when the wrench finally move, I slipped,
hit the crankshaft pulley with a tooth, and broke that. :-(
The blown gasket is shown here (no photo of the chipped (false) tooth --
SHE hasn't noticed it so it's not to be publicized).
<
http://www.gmcmhphotos.com/photos/showphoto.php?photo=32460&title=mr-gasket-7170-copper&cat=3056
>
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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