
I bought a stock 1989 350 with a 700r and installed it in my rod. I started it up, ran it (and it ran fine) and then decided to tune it. Took out my timing light and proceeded to set the timing. To my surprise there were no marks to line up with the pointer. I then dialed the timing light and the mark finally came into view until it lined up with the pointer. The timing light was now set a 40 degrees! Could it be that I have the wrong damper or has the rubber/silicone let go between the two parts of the damper causing it to spin? I know that GM used different dampers, but would the wrong one throw out the marks that much? Any help would be greatly appreciated.