Thanks for clearing that up for me Davec, you are a scholar and a gent. Its not going to get used too much and won't be worked hard so i'll just chuck some additive in it and assume its all original hope for the best and if it all goes horribly wrong then i'll cross that bridge when i come...

Hi all, this is my first post so here goes. Just bought a '79 Series 3 SWB with a petrol engine which i'm assuming is the original. What i'm wondering is, would it run on unleaded or need lead additive putting in? If its been converted isn't there usually a stamp on the head somewhere...