Impala SS427.com Message Board

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BB Valve cover leaks

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=TRQ' width='330' height='300' border=0 style='border:none;'> on 9/2/2017, 9:06 pm

What valve cover gaskets do you feel seal up best on OEM big block steel covers?

Re: BB Valve cover leaks

Posted by Pat Dilling <iframe src='https://members5.boardhost.com/impalass427/info/user=Pat+Dilling' width='330' height='300' border=0 style='border:none;'> on 9/3/2017, 3:16 pm, in reply to "BB Valve cover leaks"

I recommend these from Moroso, or similar. They are rubber vulcanized to a steel frame. If you are not concerned about strict originality, replace your bolts with studs and nuts for an even better seal.

https://www.summitracing.com/parts/mor-93040

Re: BB Valve cover leaks

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=TRQ' width='330' height='300' border=0 style='border:none;'> on 9/3/2017, 9:29 pm, in reply to "Re: BB Valve cover leaks"

Pat, GM performance parts used to make this design some time back,I used them a lot on several drag car engines I had. I had been told by a friend that this design wouldn't fit a stock BB he had.I never paid any attention back then. Do you have these on stock steel covers?

Re: BB Valve cover leaks

Posted by Pat Dilling <iframe src='https://members5.boardhost.com/impalass427/info/user=Pat+Dilling' width='330' height='300' border=0 style='border:none;'> on 9/4/2017, 8:45 am, in reply to "Re: BB Valve cover leaks"

Yes, they work well. And as mentioned, I installed studs in place of oem style bolts. I have solid lifters (L72) and being able to pull the covers off to adjust valves and reuse the gaskets is another plus. I used all-thread to make my own studs and anchored them with thread locker, then used nylok nuts on top of the little triangle shape pieces. A key thing is not to over tighten and bend the covers out of shape.

Re: BB Valve cover leaks

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=TRQ' width='330' height='300' border=0 style='border:none;'> on 9/4/2017, 9:00 pm, in reply to "Re: BB Valve cover leaks"

Thanks Pat. I didn't know how well they would seal up with stock tin covers. Thanks for the input.

Re: BB Valve cover leaks

Posted by BIGIRON <iframe src='https://members5.boardhost.com/impalass427/info/user=BIGIRON' width='330' height='300' border=0 style='border:none;'> on 9/3/2017, 10:16 am, in reply to "BB Valve cover leaks"
VIP Member and Board Expert

Cork

Check out the ImpalaArchive. Cars, parts and details.

http://s804.photobucket.com/user/impalaarchive/library/?sort=6&page=1

Re: BB Valve cover leaks

Posted by Rcrusher68 <iframe src='https://members5.boardhost.com/impalass427/info/user=rcrusher68' width='330' height='300' border=0 style='border:none;'> on 9/6/2017, 4:55 am, in reply to "Re: BB Valve cover leaks"

Those reinforced gaskets work well with the later steel covers because they are more rigid but not on the older covers. I've always had good luck with a high quality cork gasket like FelPro

Re: BB Valve cover leaks

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=TRQ' width='330' height='300' border=0 style='border:none;'> on 9/6/2017, 5:15 am, in reply to "Re: BB Valve cover leaks"

Thanks for the feedback. I have original 69 covers and I've heard there are fitment issues. I've had so-so luck with the cork gaskets. This is a solid lifter engine and hoping for a better gasket that fits correctly and be re used like the reinforced style.

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