5.9 head to block tolerance
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Professional
Joined: Apr 2018
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From: Missouri (LOZ Region)
Each head eld has a straightness tolerance. I have to change a head gasket for the third time. I want to measure the straightness of the head and deck before I put it back together. Something is not right. I’ve been doing head gaskets for 40 years and have never had a situation like this.
Champion
Joined: Sep 2012
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From: Central VA
This should help. https://www.enginebuildermag.com/201...straightening/
If you are having issues with getting a head gasket to seal, you might want to take the heads to a quality machine shop to have them checked/surfaced.
If you are having issues with getting a head gasket to seal, you might want to take the heads to a quality machine shop to have them checked/surfaced.
Record Breaker
Joined: Sep 2007
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From: PA
I've seen big block mopar heads with a twist, causing that kind of issue. Not much experience with small blocks though. I'd take the head to your local good machine shop and let them check it out, they have the tools and experience to validate.
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Professional
Joined: Apr 2018
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From: Missouri (LOZ Region)
This should help. https://www.enginebuildermag.com/201...straightening/
If you are having issues with getting a head gasket to seal, you might want to take the heads to a quality machine shop to have them checked/surfaced.
If you are having issues with getting a head gasket to seal, you might want to take the heads to a quality machine shop to have them checked/surfaced.
. I did that. I had them completely rebuilt at a local engine shop. That’s why I am asking about the tolerance. This head originally had a .004 gap. They shaved the head, and when I take it off, I want to measure it myself. 
Grand Champion
Joined: Feb 2015
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I have to change a head gasket for the third time. I want to measure the straightness of the head and deck before I put it back together. Something is not right. I’ve been doing head gaskets for 40 years and have never had a situation like this.
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Champion
Joined: Sep 2012
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From: Central VA
Please describe exactly what issues you're having - also, have you chased all of the head bolt threads in the block with a tap to ensure that the head bolts fully engage?
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Professional
Joined: Apr 2018
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From: Missouri (LOZ Region)