Assuming you were able to get them to match stock cam gears within a degree or less does not mean your cams are where they are intended to be if you have done any of the following: different cams, resurface block, resurface head, different HG.
Adjustable cam gears are first and foremost to set the cams to where the manufacturer intended (OEM or cam card of aftermarket) and second to adjust the opening/closing timing and overlap to suit your mods and desired powerband.
This is accomplished with a piston stop, degree wheel, dial indicator and solid lifter. Takes a little time but worth it. Especially on a DOHC V engine with two sets of cams.


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