3.62:1 for the norm
3.92:1 for the dohc one

put a shft in either side and mark the position at the top
then mark the pionion
turn the pinion a few times and see how many turns it takes to turn the driveshafts 1 complete revolution
if it's nearly 4 then it's the dohc one
if it's just over 3 and a half then it's the 3.62:1 one