yeh thats right, i'll check with him because i'm interested to know exactly what he's done

In the states, all our Datsun 1200s have run unleaded since around 1989. I see no valve seat wear in any of the engines I've torn down.

In 1974, Nissan changed the valve seat material, presumably for unleaded fuel. In 1976, Calfornia models had a catalytic converter, so required Unleaded. They didn't change the valves or seats that year.

do any of you guys notice a difference in regular and premium in A series engines?

spoke the guy this arvo and he said he's put in hardened valve seats so it can run the unleaded without a problem, however, a good mate's got a 120y and he runs unleaded without a problem in his

ive never tried regular in my ute but i noticed a hell of a difference in smoothness and whatnot with premium after i was running leaded

I switched from leaded to unleaded just recently when leaded petrol became unavailable locally.

I use an additive (Flashlube) but I definately need to retard the timing otherwise I get pinging.