Quote:At the risk of being critiqued again for setting the record straight, the Datsun 200B is the 810. The 710 was not marketed in Australia & it looked quite similar to the 180B [610]

I had always believed that the L20 [six] was used in the 'Datsun Personal Six' of the mid/late 60's. I once worked with a bloke that owned one. This engine wasn't known as the L20A untill after the L20B came into being, & even then, I'm not sure that this is a factory designation, but more a replacement parts industry one.

The problem with an L-six in the 120Y is not so much weight, but length. The L-four is a better choice all round.

Stick with the conversion. From all acounts, this is becoming more popular in 1200's & those that have them on the road simply love it, so I'm sure you will too.