Hydraulic tappets are taller, as I recall, nominally 17.5 mm. Solid ones are sized in increments from 14.80mm to 16.40mm or thereabouts. If a machine shop does a head with solid bucket tappets they usually grind the stem tops to achieve the desired clearance after the valve seat grinding and angle d...

No. Crank if at its timing mark can only be in the correct place. Where timing can be off 180 degrees is when the cams are upside down. So on a Volvo the cam ear that should be below the line is above the line and vice versa - with properly used timing tools it cannot happen as the tools will not fi...