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My 104.980 has an idler gear below the intake cam. This may afford me an opportunity to correct the cam timing due to the head being milled. If I make a new spindle for this idler with an offset mounting hole I can rotate it to advance or retard the basic cam timing a few degrees.
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I'd be real concerned about doing this on the tension side of the chain. If you go this route, be sure the tension wants to pull the idler in the direction of tightening the bolt not loosening it.
I'd be better with ovaling the sprocket / adjuster holes, rotating the sprocket to the next bolt hole and drilling a new dowel pin on the cam. There is a small chance you could rotate the adjuster on the helix to a new location and get the timing you are looking for. ( Or a combination of both )