The main difference between the two is the PCV valve port/channel. As a result, if you attempt to install a VS/VT manifold insulator on VX/VY Ecotec manifold, you'll end up with a massive vacuum leak.
However, you can install a VX/VY manifold insulator on a VS/VX Ecotec manifold, though installing it on a VS would require a section of the insulator to be trimmed to make room for the billet fuel rail on the passenger side
However, you can install a VX/VY manifold insulator on a VS/VX Ecotec manifold, though installing it on a VS would require a section of the insulator to be trimmed to make room for the billet fuel rail on the passenger side
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