When cams are ground they are sometimes off by alittle. Their centerline isn't where it 's suppose to be. When you degree it you are checking the centerline in relation to TDC. This way you can move the cam, usually only a couple of degrees, to center it. Or if you choose to advance/retard it.
Advancing helps the bottom end and retarding it helps the top end.
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1968 Cougar
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