What order are the pistons in a Ford 4.2?
Firing order is 1-4-2-5-3-6 Piston locations are Passenger side front to back 1-2-3 Drivers side front to back 4-5-6.
Damage is only done if the motor is an "interference" design. ie the valves and the pistons overlap in the same place, only kept from colliding by the timing chain. When the timing chain breaks on a interference design, valves and pistons smash together. If it's not an interference design, the pistons and valve won't come into contact if the timing chain breaks, so odds are no internal damage done.
oversize pistons well of coarse are bigger but you will have to take your block to a machine shop and get them to bore it to the size of the pistons you have best thing to do is take your block and pistons to the shop and let them do that for you depends where you live but to get it bored can average to a $100 or up and if you get oversize pistons…