If you turn the crank so that it is 10 degrees before top dead center, you can then rotate the cam to the alignment mark, then rotate the crank to top dead center, set the timing chain and you are done. Remember, it is only interferance when the piston is at top dead center.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"