Over the Road applications
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TOPIC: 5.7 liter Vortec

5.7 liter Vortec 07 Feb 2020 08:50 #13

  • Ron Hatton
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Hello, Drew!
There are quite a few posts here about the benefits of eliminating the PCV valve, so I am at a loss as to why you would be reluctant to eliminate it!

Start here:
Ron Hatton
Developer of The Gadgetman Groove
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5.7 liter Vortec 07 Feb 2020 10:30 #14

  • GregK
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Drew - just to clarify or focus the direction our fearless leader Ron pointed you in to do your own research, the P in PCV stands for positive; we modify that to be much more Passive, and variable as well, so that the ventilation happens most when it’s needed most, when all the vapours and gasses the system is meant to evacuate are at their highest level of production. To do that we swap one small valve for a much bigger (and much more reliable) one that you control, the throttle valve we put our Groove into.
Does that help?
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5.7 liter Vortec 12 Feb 2020 13:58 #15

  • drew
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Greg,

The instructions with the TB from Ron says to remove/plug the PCV. Your post here on a Vortec 5.7 says to modify it. I was hoping to look at the instructions you mention to see if I'd like to do it instead of completely plugging the system.

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5.7 liter Vortec 12 Feb 2020 16:44 #16

  • GregK
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To clarify: Ron’s instructions tell you to cap the vacuum source of the PCV system at the intake manifold.
The valve itself can remain in place in the rocker cover, and the hose that you disconnected from the intake manifold can get connected with a T-fitting to the breather hose.
When you think about this, and implement the mod this way, any vapours that wind up under either of the valve covers still can make their way into the intake for emissions purposes, but by removing that “outlet” from a continuous vacuum source (the intake manifold, which is under an 18-20” vacuum at idle), to a passive and variable one, ahead of the throttle body, allowing the engine to suck in what it needs when your right foot digs in on the “Go!” Pedal.
Does that make sense to you?

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