Most people(Even Mechanics) don't realize you have two measurements that need to be right for propery starter function.
1. The gap between the starter and flywheel gear must be measured with pin gauges. I don't remember the spec but I could look it up. To increase the gap, you put shims between the starter and engine block.
2. Starter gear nose to flywheel distance. This one gets alot of guys. Your starter needs to be in the sweet spot so your gear has room to move and mesh with the flywheel. To close and it won't engage all the time and grinds. To far away and you have inadequate engagement. Nose shims are available for change this distance. If they are both on the money, you should enjoy a long starter life and no nooise.
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Todd
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