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Old 10-11-2019, 04:27 PM   #1
Flynman
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Default LS Header Clearence Issue

I have a Gen3 6.0 LQ9 with PRC cylinder heads and an Art Morrison Chassis. I am putting long tube headers on it and I have some clearance issues with one the header bolt holes that is not being used for this application. The hole sticks out past the block for use with a different engine I assume. The headers are Ceramic coated so I cant knock a dent into it to get the 1/4 inch clearance that I need. I am wondering if I could grind/cut off that ear about 1/2 way through which would leave just a semi-circle portion attached to the head? Wondering if this could cause any cracking or heat disappation issues? What do you think?

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Old 10-11-2019, 04:56 PM   #2
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Are you talking about the blank hole in the left hand side of the photo?

Yes you can do what you propose, but if you cut/grind on that spot and leave bare steel exposed, it will rust. No harm functionally but surface rust will look bad.

If it was mine I'd leave it alone.

Also with no bolt there, I have to wonder about exhaust leaks. Without a bolt hole for both cylinders, why did they cut the flanges like that?

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Old 10-11-2019, 05:06 PM   #3
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Just remove the area you need clearance with Radius it to not leave sharp edges and will be fine. The PRC heads have holes on bottom of the head, which are for aftermarket blocks. Won't effect anything on a stock block nor leak exhaust. The head is AL so no issue with rust.
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Old 10-11-2019, 05:26 PM   #4
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Rick L it's the cylinder head bolt on left bottom. I did not install the missing header bolt on top left yet because header flange won't sit flush and I was just test fitting it. The headers have 3 bolt holes per 2 tubes which matches the header bolt pattern on the cylinder heads.
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Old 10-11-2019, 05:29 PM   #5
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Thanks BO185!! I thought that was the case, but it doesn't hurt to check with others who have more knowledge!!!
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Old 10-11-2019, 07:49 PM   #6
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Okay so I cut off about 1/3 of the extra bolt hole and now have good clearance. Just have to shape and smooth it a little bit!!
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Old 10-11-2019, 10:50 PM   #7
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I missed which hole. I thought you wanted to cut on the header not the head.
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Old 10-11-2019, 11:37 PM   #8
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personally I would pull both heads and put them on a 90 degree mill table and mill the extra head bosses off flush with the block deck surface. it would look much better that way.
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Old 10-11-2019, 11:55 PM   #9
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Quote:
Originally Posted by hotrodg726 View Post
personally I would pull both heads and put them on a 90 degree mill table and mill the extra head bosses off flush with the block deck surface. it would look much better that way.
Concur
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Old 10-16-2019, 03:29 PM   #10
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Quote:
Originally Posted by hotrodg726 View Post
personally I would pull both heads and put them on a 90 degree mill table and mill the extra head bosses off flush with the block deck surface. it would look much better that way.
Before I did that I would pull the header & try to saw off the flange w/a air powered body saw like Horrible Freight sells.
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