Originally Posted by greg hescock
I have a question on the position of number one clyinder on the distributor cap. I have two 350 chevys, on my ZZ4 crate motor on the cap as you face the distributor # 1 is at the about 530 on a clock. on my 350 in my other car (the serial number says it is a 1975 350) it is at 630 on the clock. The 75, motor runs terrible, would it run it the wires where off one position. Is # 1 always in the same position?
Traditionally , GM #1 location is 5 to 7 O 'clock on the cap tower..
IF the rotor is slightly off on the one that runs poorly, mark the base of the dizzy with a marker dead center of #1 tower from the cap, then compare it to where the rotor is pointing..IF it is not too far away, simply loosen the hold down and advance or retard the dizzy rotor to match the mark..Then re~time with a light.
If it is like a tower width off, you'll have to reset it..that may have occurred because when you set the dizzy, it will turn as it seats because the gears are diagonal cut..you will need to set it back that distance to get it on #1 again.