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Home » Public Forums » GMCnet » replacing driver's side head on a 455 (Jumping into unknown waters and any help appreciated)
Re: replacing driver's side head on a 455 [message #364947 is a reply to message #362954] Thu, 24 June 2021 10:05 Go to previous messageGo to previous message
rgogan is currently offline  rgogan   United States
Messages: 82
Registered: February 2004
Location: Milwaukee, WI
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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.

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