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Discussion Starter #1 (Edited)
What is the difference between 4 and 2 barrel air cleaner?

I see 2 and 4 barrel air cleaner housings on eBay. What is the difference between the two? This for a 289 or 302 engine.

Just was wondering.

Thanks
 

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1967 Mustang GT fastback
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There is no difference between a 2v and a 4v air cleaner housing, given the same year of engine.
Wait -- one difference may be the closed emission option - available in most years, but it did require a change - the air cleaner housing had an inlet nipple with this option that allowed a hose venting in from the oil filler cap to connect to it.
But even this was the same regardless of 2v or 4v non-hipo small block engines.
 

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