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I had my Stage V head intake surface machined for o-ring material, no gasket required.

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Where did you find the correct size one piece rectangular shaped o-rings to fit around the ports?

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You go to the local hydraulic hose supply and buy the diameter raw stock of O ring in a role and make your own O rings in the square hole, glue the ends together with Super Glue The heads need to be machined for the proper depth and I.D. for the Oring material you want to use I'm trying to remember what we needed to do to keep the trash out between thw intake ports between the heads and intake, blower manifold