Brian; The teeth on the cam are at an angle. So when you put the dist into the block the rotor is going to rotate a little. You need to take the dist out and back off the rotor a little, then when you install it the rotor will travel into place. It takes some trial and error to get the feel of this proceedure. I think Fomoco is the only one who has straight cut dist gears....Russ __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com