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Where can I get a replacement rocker box gasket for my Rover 600 Si?

I have had trouble sourcing a replacement rocker box gasket for my Rover 600 Si. Registered in October 1996, it has a Honda engine and the oil leaking from the gasket is finding its way down into the spark plug recesses and is causing the engine to miss-fire when under acceleration. A month long search has not borne fruit.

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No problem, you can make your own gasket. Use an old cereal box to make a template, order your material from a company like Ram Gaskets ( and then all you need is a sharp craft knife to do the cutting.
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Smart-looking car, best with 2.3 engine. Honda Accord based and the most reliable Rover of its era.

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