Join Date: Aug 1998
Location: Waldorf Md. USA
The crankshaft turns two complete revolutions for each turn of the cam. If you install the cam "dot" to dot, and then turn the crankshaft one complete turn, the dots will both be straight up. When you install the cam "dot to dot" at that position the motor is on the compression stroke tdc for the #6 cylinder. If you turn the crank one turn, it will be on #1 tdc compression. So it really does not matter how you align the dots when you install the cam, even though it is easiest to do them "dot to dot". What confuses most people about this procedure is installing the distributor properly. they think that because they have installed the cam "dot to dot" they should install the distributor in the #1 firing position. Obviously this will not work. You have to instal it in the #6 firing position. If you want to get even more confused...there really is no "correct" position for the distributor, as long as the rotor is pointing to the number 1 wire when it is time to fire the number one plug, thats all that matters. This seems to be very hard for most people to understand, and it is probably even harder to desribe it in writing, rather than showing it hands on.
Hope this helps,
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73