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I know there are two different kinds of harmonic balancers for the SBC (not counting sizes). One is keyed to put the TDC mark at the top and one is keyed to put the TDC mark down the driver's side about 10-20 degrees.
When I built my 305 I used a balancer that is keyed to put the TDC mark down the side. I verified this when I degreed the cam and found TDC.
Now, the engine is in the cruck and running. However, in order to make it idle the best, I had to rotate the distributor until the timing mark on the balancer is at the top. This is with the vacuum advance disconnected and plugged.
Why is my timing mark off that way?
Jack
When I built my 305 I used a balancer that is keyed to put the TDC mark down the side. I verified this when I degreed the cam and found TDC.
Now, the engine is in the cruck and running. However, in order to make it idle the best, I had to rotate the distributor until the timing mark on the balancer is at the top. This is with the vacuum advance disconnected and plugged.
Why is my timing mark off that way?
Jack