I've started stripping down a 1275 S engine of mine to check over and rebuild.I was pleased to find it has an original 163 head and that the bore looks ok and is only at +20. I've not come across these 21962 pistons in an S engine.I'd like to know if they are up to the job or should be replaced? The engine rebuild will be for road use. I have a NOS set of 19320 pistons I could use if the 21962 are not really suitable. A bit of googling suggested they are standard Metro pistons.
Thanks for any advice you can give me. I know that piston range and availability has changed a lot over the years.
Peter