So I have a 90' fc with a 13b in it and I was wondering how to change the spark plugs and which ones I need.

I went to autozone and they asked if I needed the trailing ones or the leading ones, and I had no idea so I ended up with 2 leading ones. When I got home come to find out it has 4 spark plugs.

I saw a video on youtube and they said the top 2 are the trailing and the bottom 2 are the leading. Is this true?

Thanks in advance

 

welcome to the board.

yes. there are a total of 4 spark plugs: 2 leading and 2 trailing. trailing plugs are generally a little colder, plus they should have the "T' on the box. get NGK plugs, even if they have to be ordered.

... and yes, correct: Trailing = Top and Leading = Bottom.

 

2 of the BUR7EQ (leading plugs,lower holes)

2 of the BUR9EQ.Trailing Plugs,TOP holes)

those are Ngk brand plugs,standard for 13 engines.
Tip.Leading is L..Lower..
Trailing is TOP ..T
easy peasy huh?

 

The letter is the easiest way to remember:
T = Top = Trailing
L = Lower = Leading

This link explains the spark plug choices pretty well:
Mazdatrix - Spark Plugs

 

Thanks every one, now I just gotta figure out how to take em out and put em back in without breaking anything XD