MAHLE Original Valve Cover Gasket - Rubber - Gray - GM LS-Series WEHWM429RE They are rated in flow

They are rated in flow capacity "cubic centimeters per minute" and are changeable for tuning purposes

2 to 20 psi

Pin location varies with each application

the shifter can be also customized to control nitrous

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MAHLE Original Valve Cover Gasket - Rubber - Gray - GM LS-Series WEHWM429RE They are rated in flowMAHLE(R) gaskets provide world class sealing products trusted by OEMs & Technicians around the globe. Product Description: Valve Cover Gasket Rubber Gray GM LS Series MAHLE ORIGINAL produces a broad range of products, including camshaft, connecting rod, and main bearings for a variety of engines. MAHLE ORIGINAL CLEVITE also offers a complete line of diesel engine components, from piston rings and gaskets to complete turbocharger assemblies.