Morris Minor Owners Club

thanks for the advice guys. i dont do high milage so in the meantime i will stick to the addative i have been using.

About a year ago i bought a 1968 morris minor that had a replacement engine fitted. At the time i neglected to ask if the engine had an unleaded head. I have been unable to contact the previous owner as he has moved house. My question is, is there any way that you can tell whether an engine has an u...