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My heads are D3VE and have a square hole between the middle pistons. There is the same square hole in the intake manifold that goes to a plugged cap. The Felpro gaskets do not have this hole. Is there a gasket for this situation or should I just let it block the flow between the head and manifold since it is capped anyway? I do not know what this would be for. Any suggestions are welcome.
It looks like your manifold has the CJ or possibly police port exit size to me. To make that work with a D3 or any regular production head you'll need to use a gasket with a CJ sized hole. I'd recommend using either the Cometic or Fel Pro with the metal core.
The hole in the center is for the exhaust crossover and most of the time with an aluminum intake it isn't necessary.
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