Truck Repair: firing order, drive pulley, tdc mark

Question
on 2000 n14 what is firing order for A  B  C  marks on acc. drive.   thank you

Answer
Well the firing order is 1,5,3,6,2,4.The letters on the accy drive pulley are just for valve adjustments.If you look close between C & A you will see a TDC mark for 1 or 6.Now if you are going to use the letters for valve adjustment,they are A is 1 or 6,B is 5 or 2, & C is 3 or 4.