On Wednesday I plan to tackle my valve seals. My question is, how do I know when cylinders two through five are at top dead center? If I just point the corresponding lobes on the camshaft away from the rocker arms will that be close enough, or will I end up dropping a valve into the cylinder?

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1982 300D, black w/ palomino leather, 203K
2001 E320, champagne, 105K (Mom's)
1999 Dodge Dakota, squeaky & battered, 142K