The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Fel-Pro Carb Base Gasket surfaces not flat

Oberon67 · 07-13-2023, 03:11 PM

Hi all.

I just ordered a carb-to-manifold gasket from Rock Auto. It wasn't the cheapest one, it's a Fel-Pro. So I get the thing in the mail and look at it, and I see that it's got a hard plastic "grommet" around each bolt hole. Which is fine, except that one of the grommets isn't completely in line with the gasket surface. It's proud on one side by a few thousandths, about the thickness of a piece of notebook paper. That's enough to constitute a vacuum leak.

The gasket is about 5mm thick and made of some hard-resin-impregnated fiber. I may get a piece of fine sandpaper, lay it flat on my table saw, and hone the face of this gasket against the sandpaper until I bring the grommet down flush with the gasket surface. I'm also wondering if application of a little Permatex Aviation sealant would help.

What do y'all think?

07-13-2023, 03:11 PM	#1
Oberon67 Registered User Join Date: Mar 2016 Location: N/A Posts: 146	Fel-Pro Carb Base Gasket surfaces not flat Hi all. I just ordered a carb-to-manifold gasket from Rock Auto. It wasn't the cheapest one, it's a Fel-Pro. So I get the thing in the mail and look at it, and I see that it's got a hard plastic "grommet" around each bolt hole. Which is fine, except that one of the grommets isn't completely in line with the gasket surface. It's proud on one side by a few thousandths, about the thickness of a piece of notebook paper. That's enough to constitute a vacuum leak. The gasket is about 5mm thick and made of some hard-resin-impregnated fiber. I may get a piece of fine sandpaper, lay it flat on my table saw, and hone the face of this gasket against the sandpaper until I bring the grommet down flush with the gasket surface. I'm also wondering if application of a little Permatex Aviation sealant would help. What do y'all think?