So this weekend has been a live in the garage weekend for me with doing two Headgaskets and Timing Belts. On M20's arg boring dirty work. So when I pulled my 89 325i apart it appeared to have a nice rebuilt head but had some oh so crappy champion plugs in it. The were lean on the burn too. Had me puzzeled as this car burns rich but started thinking about the scale which Champion uses and they are cold plugs not hot plugs like NGK and Bosch.

Car runs like a champ now. Eta well runs strong but not the greatest as it needs clean injectors and fuel filters.