The timing marks align every two turns of the crankshaft. If you install the cam with the marks aligned with each other, the next turn of the crank will have them as far apart as possible. Always turn the engine twice to make sure you haven't made an alignment mistake on the tooth pattern.

Exception to the rule- - - - -I assembled a Ford 3000 tractor engine once, with a very complex timing gear set with about three idler gears for accessory drives. Everything was timed with punch marks. I rotated the engine twice, and a couple of the marks were out of time. Tear it down and reassemble- - - -four times! It turns out the idler gears were made with a "hunting" patern to equalize gear tooth wear, and the timing marks aligned again after 96 turns of the crankshaft!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!