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Reply to "Weber air filters"

You can use a filter IF you are using a "Weber" camshaft.

That camshaft will reduce and close to eliminate the blowback of the fuel through the carbs.

If you are using a conventional camshaft you will get enough fuel blown back to saturate the filters and they WILL catch fire on a restart.

They are also very restrictive and you will loose something like 80hp by using them.

The compromise is to use screens on the stacks and you can get tricky by increasing the surface area of the screens from just flat.

Believe it or not, the screens are restrictive too. The restriction isn't exactly equal to a direct proportion of the surface area of the screens, but it's close.

If you double the surface area of the screens you reduce the restriction by 1/2.

I know someone that drove a 289 Cobra, former Shelby factory race car on the street for 20 years with no air cleaners or screens. No issues.

You just want to keep from sucking in big bugs, squirrels and stones. Small, slight build mechanics are also at some risk.
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