I am looking at purchasing an 83 ADM sprinter which has a silver top 4AGE 20 valve installed into it. The guy who i am looking at buying it off told me that you do not need an engineers certificate for it because it is the same series of engine i.e. 4A.

i have looked through some really old threads about converting from a 4AC to 16valve 4AGE, but there is nothing on the 20 valve.

I really want this car, but i dont want to have to try and get engineers certificates before rego is due.

P.S. It needs to meet NSW RTA requirements