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I know about the spigotted head changes, but not the oiling details. Transmissions and primarys were absolutely different, as were the drillings on the cases to mount them, and there is a case  to primary spacer on the G/N15 and probably the P11.


Looking at parts books I don’t see much else to support the claim that Matchless improved the Atlas engine- but I’m eager to be proven wrong about that.


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