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70rs/ss · 09-26-2008, 06:04 PM

As said several times already, yeah you should run one. High end hp machines, actually pull major vacuum to build a more positive seal around the rings (and can add 5-10% more hp), but this is in extreme motors. On a stock or even a 500hp BBC the positive ventilation can still help evacuate blow by (all motors do it, some more than others), and it'll help promote a positive seal for your rings (not a ton more power, but every bit helps) and will prevent explosive gases from filling up the underhood area, as well as helping the motor to run cleaner and more efficient. Sorry, for the long answer after it had been answered several times, but this is free and easy power just waiting (and a lot safer too!!)

09-26-2008, 06:04 PM	#7
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: Are PCV's necessary? As said several times already, yeah you should run one. High end hp machines, actually pull major vacuum to build a more positive seal around the rings (and can add 5-10% more hp), but this is in extreme motors. On a stock or even a 500hp BBC the positive ventilation can still help evacuate blow by (all motors do it, some more than others), and it'll help promote a positive seal for your rings (not a ton more power, but every bit helps) and will prevent explosive gases from filling up the underhood area, as well as helping the motor to run cleaner and more efficient. Sorry, for the long answer after it had been answered several times, but this is free and easy power just waiting (and a lot safer too!!)