Hi Wig,
there are no dumb questions, except for the one that is not asked and a goof up results.
The Engine Cylinders on a Fifteen will be numbered from the front of the engine.
Firing order is 1-3-4-2.
Valve Lash 0.008" all valves-cold.
Hope this helps.
Cheers,
Eddie B.
Per the instruction manual, 1-3-4-2.