Best /Cheapest place for Briggs parts

Sometimes it's better simpler and far cheaper to have a sheet of gasket paper and an X-Acto knife.

Or for non-critical uses, just use a good grade Silicone Form In Place Gasket and leave out the paper entirely. Detroit has started doing that more and more. Not so good for thin oil pans where the flange will distort over time, works fine when mating cast pieces.

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Here's a nice You Tube video of the process.

Lots of the new Honda lawnmower engines are put together that way.

Stuart