looking at the exhaust manifold... i hate how the one cylinder has no running length ... that cyl there would be the first to be eaten in the event of too high of egt.
i've seen it before when my mechanic picked up a toyota 2.4D truck... the compression got progressively worse as he went to the rear of the motor.. 320-120-90-30... guess which cyl had the shorted length on the exhaust hehe...