Do You Really Need a PCV Valve in Your Classic Car

We'll look at the PCV system on the 1971 GMC truck to see how bad the blow by is on this small block Chevy engine. We'll remove the PCV system and install a catch can to see what it collects. Don't get it twisted. You must obey the local and state laws where you live in regards to your vehicles emission systems.

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#pcv #pcvvalve #catchcan