Mustang Spark Plugs
Discussion
Fartgalen said:
Will that also be the case for a Roush 427 ? (2007)
Yes. Same heads. However, at some point, Ford modified the heads and plugs but I can't recall what year that was (after 2007 I'm sure).
In general, provided you're careful and use some penetrating oil (not WD40), there isn't a problem and most come out. Reports suggest far more full sets come out than break.
I haven't tried mine as you do need a long deep box spanner to get at them and the ones I have are inevitably too short. I suspect this may be part of the problem with people not realising the plug spanner isn't deep enough though I am speculating here. Mine were changed with the supercharger at 2000 miles so I would assume they changed the plugs anyway.
As yours is supercharged, it should have different plugs anyway but the issue is whether they are 2 piece plugs and whether there is a build-up of carbon on the long nose of the plug which makes removal difficult. Again, reports here suggest this build-up is not that common. There are a few extractor tools floating round the clubs to get them out if they do break.
Edited by LuS1fer on Friday 4th January 12:28
Yes. As I said, its from 2005 to 2008. Thats when they modded the plugs. 2008 onwards are the one piece normal looking plugs. When you take the coil pack off, if it has a black boot on it, then its the early type plug. If it has a brown boot on it, then its a late one piece safe plug. Some 08's still have the early plugs in.
The 427R came from the factory supercharged so the plugs will be stock. I hope they have been out and cleaned.! If not get it done asap. and be careful again. They will snap if you are in to much of a hurry. Clean them and put them back in again. 9/16 socket on at least a 12" bar and you are good to go.
Mike
www.modurstang.co.uk
The 427R came from the factory supercharged so the plugs will be stock. I hope they have been out and cleaned.! If not get it done asap. and be careful again. They will snap if you are in to much of a hurry. Clean them and put them back in again. 9/16 socket on at least a 12" bar and you are good to go.
Mike
www.modurstang.co.uk
Edited by Yellastang Mike on Tuesday 8th January 21:37
Yellastang Mike said:
Yes. As I said, its from 2005 to 2008. Thats when they modded the plugs. 2008 onwards are the one piece normal looking plugs. When you take the coil pack off, if it has a black boot on it, then its the early type plug. If it has a brown boot on it, then its a late one piece safe plug. Some 08's still have the early plugs in.
The 427R came from the factory supercharged so the plugs will be stock. I hope they have been out and cleaned.! If not get it done asap. and be careful again. They will snap if you are in to much of a hurry. Clean them and put them back in again. 9/16 socket on at least a 12" bar and you are good to go.
Mike
www.modurstang.co.uk
OK - I read in one of the Roush booklets I got with the car that they have installed "Roush plugs" as part of the upgrade ?!?The 427R came from the factory supercharged so the plugs will be stock. I hope they have been out and cleaned.! If not get it done asap. and be careful again. They will snap if you are in to much of a hurry. Clean them and put them back in again. 9/16 socket on at least a 12" bar and you are good to go.
Mike
www.modurstang.co.uk
Edited by Yellastang Mike on Tuesday 8th January 21:37
Sorry. You mis understood my poor explanation. !!! What I meant was , the supercharger was put on when the car was new, with 0 miles on it, and the plugs were fitted then, so will probably have not been out from new.
Does that make more sence.? lol
Does that make more sence.? lol
Edited by Yellastang Mike on Tuesday 8th January 21:52
Right then - to sum up ! 
The 427 will still have the regular 2 piece plugs - even though the Roush book says "Roush plugs installed". (Or Roush plugs - are regular 2 piece plugs).
And no - they've probably not been out since new.
If/when I take them out and want to replace - what's the recommended plug ? The booklet I have just says Roush P/N R07030001. Is that a 2 piece ?
The 427 will still have the regular 2 piece plugs - even though the Roush book says "Roush plugs installed". (Or Roush plugs - are regular 2 piece plugs).
And no - they've probably not been out since new.
If/when I take them out and want to replace - what's the recommended plug ? The booklet I have just says Roush P/N R07030001. Is that a 2 piece ?
You might want to look at Brisk plugs but get the one for your supercharged application as they require a colder plug. They also have to be gapped slightly narrower to stop the spark being blown out. There are other plugs with a one piece bridge but these are harder to adjust the gap on, needing a little compressing tool.
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