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06-27-2010, 01:44 PM
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#1 |
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Member
Join Date: Aug 2008
Location: Benton, Arkansas
Posts: 402
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Cracked guide boss in Aluminum head
I recently got my LS1 stocker heads back from machine shop and noticed that several of the valve guide bosses were cracked, where the new guides were installed. One is appx one inch down in the runner. My head guy, would rather not mention his name, informed me of this and said it was common. Has anyone ran into this? Is it a problem? Thanks for any info.
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06-27-2010, 03:18 PM
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#2 | |
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Banned
Join Date: Feb 2008
Posts: 852
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Re: Cracked guide boss in Aluminum head
It's a GM casting.
Quote:
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06-29-2010, 10:47 AM
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#3 |
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Senior Member
Join Date: Feb 2009
Posts: 967
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Re: Cracked guide boss in Aluminum head
they can split when ball sizing or burnishing a guide liner. the ball size can be too large for the liner too expand. always used to sneek up on the size. it should'nt happen if a solid guide is used. either way i was'nt conortable with that situation.
Last edited by richie 2; 06-29-2010 at 12:30 PM. |
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06-29-2010, 11:42 AM
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#4 |
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Member
Join Date: Oct 2003
Location: Sheboygan Wi
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Re: Cracked guide boss in Aluminum head
I don't know where you're located but , you could call Jeff, at Modern Cyl Heads, Clinton Township, Mi ! The number is 586.468.7914, or 586.465.2811 ! He's really good !.....Later........John
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John Lang 365 STK, SS |
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