Thread: Chevy 350, zero compression. engine not starting

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I don't know why you would be confused. That video is showing the same thing I told you, cam gear at 6PM, crank gear at Noon, then rotate the crank one complete revolution so that the cam gear is at Noon and the crank gear is at Noon. Now the motor is ready to run the spark plug wiring and phase the rotor at 5:30 PM, firing #1

Chevrolet engineers opted to line up the dots at 6 and noon to fire #6. They could just as easily have lined up the dots to fire #1, without having to turn the crank 360 degrees, but they didn't. You can also assemble the motor with the cam gear at Noon and the crank gear at Noon, so that the motor is ready to fire #1 without turning the crank 360 degrees, but it's harder to see the relationship between the cam gear dot and the crank gear dot with both the dots at Noon because they are too far apart.

Perhaps you're confused because you don't realize that the cam gear, being twice the diameter of the crank gear, rotates 1/2 as fast as the crank gear. For every rotation of the cam gear, the crank gear rotates twice. For every rotation of the crank gear, the cam gear makes half a turn.

I didn't mean for you to pull the motor apart is it was back together. With the cam gear at 6PM and the crank gear at Noon, as assembled, it is only necessary to turn the crank one complete revolution to get the motor timed to fire #1. You can do that when the motor is completely assembled, you don't have to disassemble to turn the crank. You just have to pay attention and make a 360 crank rotation.

Jerry's explanation works also if you pay attention. It has always been easier for me to assemble on #6, then turn the crank to #1.

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