Das war die Quelle:
Given a 90.3mm stroke of the first-generation 2.8 VR6, 164mm con rod length, ±12.5mm cylinder offset and assumed zero piston-pin offset, maximum true stroke is 90.585mm. On the right bank with positive cylinder offset (toward the anti-thrust side) the maximum stroke length occurs at 186° CA (referenced to TDC), and the pistons' closest approach to true TDC occurs at +3°CA (0.0016mm below true TDC). On the left bank with negative cylinder offset, the same maximum stroke length of 90.585mm occurs at 174° CA and closest approach to true TDC occurs at -3°CA