Morris Minor Owners Club

I am restoring a 1965 2 door and have just split engine. Cylinder head has casting number 12G202 SM on it, is this a modification. Also there seems to be inserts on the exhaust valves does this mean its unleaded. Unable to post pic as took it with my phone and when I try to attach it site says file is too large.

The 12G202 cylinder head is the standard cylinder head for the 1098cc Morris 1000 engine and was made for use with leaded fuel.
If the exhaust valve seats have been replaced with inserts the cylinder head in all probability has been converted to use unleaded fuel..

Many thanks for the info. It also looks like it has been rebored as pistons are marked 0.508 which I believe is equivalent to 20 thou.
As a matter of course given engine is dismantled should I replace the piston rings.

Before doing anything check the piston ring clearances and go from there.
Piston ring clearances are given in the BMC wksp manual.

I am about to fit a new ring gear to flywheel and never noted which way round it goes on. Am I correct in saying teeth with tapered fronts faces the direction of the gearbox.

You are correct in that the lead in for the starter Bendix on the ring gear faces the gearbox.