For 87 to 89 Porsche does not want you to grind the flywheel because of possible interference from rubber center disc. I've done it before but you have to be carefull of clearance between disc and flywheel. Clearance should be at least depth of disc material to rivet head. Web thickness minimum is 9.9mm. If the flywheel was a virgin flywheel you should be able to take about 10 to 20 thousands off. Grind flywheel only; do not turn.
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