Does a 1HZ need a catch can?

Yes, factory 1HZ do not, but many 1HZ do. What I should have said was it’s especially important to run a catch can on motors that are turbo’d, even more so for ones with intercoolers. My intercooled 1HDFT has a crankcase breather venting to atmosphere, but a catch can is in the works (oil fumes are nasty).Sep 1, 2009

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