plugs-which ones are trailing/leading ?

[RobMatthews]

Hi prob a easy search question but i cant find it so which plugs are trailing and which are the leading ones please?ie logicaly i would say the top ones are the leading two and the bottom ones are the trailing two is that right? thanks rob

[Jürg Hensdiek]

Hallo,
 
Top must be trailing
Bottom must be leading
 
Merry Christmas
Jürg Hensdiek

[David Nock (RIP)]

Hallo,
 
Top must be trailing
Bottom must be leading
 
Merry Christmas
Jürg Hensdiek

The !2A engine in the 1st Generation FB is Top Trailing, Bottom Leading. Castings are marked \'T\' or \'L\' at the side of the plug, (but I can see them on the FB, I\'m told the FD is much harder to access)!

[RobMatthews]

my car is the 3 gen fd3s thanks

[Jit]

Trailing = Top
Leading = Lower