Trimming a valve cover gasket?

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slappnutz

Not-quite-so-new-guy
Jun 27, 2018
42
22
8
So i'm having a debate if i should attempt this or if its even a good idea. 350 sbc with vortec heads, center bolt covers. I have to run a double thick gasket for clearance. Old one was leaking bought a new set of felpro dbl with metal gasket in the middle. Here is my dilemma, its a little to snug to fit in the valley without trimming the inside corners a bit. I'm thinking a dremel with a sanding wheel to shave off a little bit to make it fit properly. Anyone have experience with this? i searched the forum and google with not a lot of luck.
 

Clone TIE Pilot

Comic Book Super Hero
Aug 14, 2011
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Are you using the Vortec specific valve covers and gaskets or the pre Votec centerbolt style valve covers and gaskets?
 

slappnutz

Not-quite-so-new-guy
Jun 27, 2018
42
22
8
something similar to this. not the greatest but they do the trick.
valvecovers.jpg
 

slappnutz

Not-quite-so-new-guy
Jun 27, 2018
42
22
8
The rockers fit fine. It’s the actual cork gasket that doesn’t fit in the valley.
 

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John Canon

Apprentice
Apr 19, 2022
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Vancouver Canada
I would use an Exacto knife and a cutting mat or flat piece of wood. Use an ultra-fine Sharpie marker to draw the line, then the Exacto knife to cut gradually deeper and deeper until done.
 

slappnutz

Not-quite-so-new-guy
Jun 27, 2018
42
22
8
That’s kinda what I was thinking but it has a metal gasket sandwiched between the cork. That’s why I was thinking a dremel.
 

Streetbu

Know it all, that doesn't
Supporting Member
May 22, 2011
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Personally I would run the blue rubber gaskets that the valve covers come with originally. JMO
 
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Clone TIE Pilot

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If you cut the cork gasket you will expose the shim core which can allow oil inside the gasket and eventually cause leaks. I guess you can seal the cut corners with RTV. I have not seen SBC valve cover gaskets with such thick corners. Generally, I use steel core rubber valve cover gaskets instead of cork.
 
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565bbchevy

Geezer
G-Body of the Month
Aug 8, 2011
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I only use steel core rubber valve cover gaskets.
 
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