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Your cam should be drilled and tapped with left hand threads. The spuds come in different lengths and you can measure to figure out which one you need. Be very careful on a Fontana not to put forward pressure on the cam once the p/s pump is bolted in as it will cause the plate holding the cam in place to sieze to the cam and lock the engine after a few seconds of running. Been there...done that. Voice of experience!
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