Aluminum valve cover install -
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Unread 09-25-2011, 09:03 AM   #1
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1983 CJ7 
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Aluminum valve cover install

I bought an aluminum valve cover to replace the plastic one and 2 mounting holes on the intake side need to be drilled & tapped. I read through many of the threads reguarding this install, and all say to not go to deep or you'll hit water. None said exactly how deep the drill should be. Anyone know?



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Unread 09-25-2011, 09:14 AM   #2
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When I did mine, I didnt go more than maybe a 1/4 inch. It was last year so I can't remember off hand. If you do a search there are many threads discussing this. That is where I got all my info. Actually, just about everything I've thought about has been discussed on here.
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Unread 09-25-2011, 10:34 AM   #3
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Mine had the holes so I did not have to drill. I just used a blind tap as far as I could go. My holes were only deep enough to cut maybe 3 threads, which is fine because it is not like there is a lot of torque on those bolts.
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Unread 09-25-2011, 06:43 PM   #4
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how long are the bolts that go into the cover? put them in the aluminum cover and see how much deeper they would go..
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Unread 09-25-2011, 07:31 PM   #5
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I've done it twice now (2 different engines) first time I drilled about a 1/4 inch and hit the water jacket, second time I drilled about 1/8 inch and used a bottem tap. Like the poster before it wont cut many threads but it holds fine, you may have to put a couple washers on the bolt it it bottoms out before it tightens. Or you could put studs in, thread locker and put nuts on it. Good Luck
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