So I purchased a 1990 5.0 approximately two months ago. I realized I had an exhaust link and decided to buy new headers. While replacing the headers, I decided to switch out the spark plugs. I went to advance and told them what I had. They gave me a set of spark plugs. I got home and quickly realized they were incorrect. I took my old spark plugs up to advance and they said they outta of a 96 4.6 mustang.

However, my old headers were mac product. I ran the numbers online and they are for 302 or 5.0 V8 mustang.

How can this be? I am a little confused right now. I am new to this and just trying to understand. Also now my headers will not mount up to the current exhaust pipes. Is this normal?

What do I have to do now? Take the car to a shop and get new exhaust to make it work properly?

Any advice would be great! Thanks

 

pictures would help greatly

 

what plug numbers did you take out everybody usually runs autolite 25 or 26

 

For a person to tell you a plug is out of a specific vehicle is nonsense. That person doesnt have a clue. There are plugs that fit a variety of vehicles. All else fails look on line for the plug # you need and ask for that specfic #

 

just pull one of the plugs you have out of the head and cross reference it to the brand you want.