well im not sure what mine is but i know its got rockers with little rollers on the lobe side of the arm the cam is over head with lash adjustment on the other end of the rocker arm

the exhaust bolts go \ \ \ \  if that means anything?

ive picked up a cheep cheep probably really inefficient CT20  the add said OE replacement CT20; 17201-54060 for the money i said stuff it if i get 2 years out of it im doing good and im not after anymore than 10 psi so efficiency shouldn't be to bad ehh it will make some improvement to the old tractor engine at least

i was thinking 6-700c pre turbo at the flange so guess ill roll with that