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On all the cars I've got or seen the large hose goes to the air cleaner or air inlet system. the smaller hole is for the intake. The routing is such that clean air after the air cleaner filter is routed to the top of the rocker arm covers and is then pulled into the intake by vacuum. As it travels around inside the engine it pulls vapors and blowby into the intake to be burned by the normal combustion process. This is how it works even on my V-6 mod. HTH.
Ron
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