spark plug sizes?
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spark plug sizes?
I have what was told to be a 1993 Thunderbird 5.0 HO motor. It was an EFI, but had a double sump oil pan. I found out that most if not all Tbirds has a single sump when I ordered an aftermarket pan.
So the other day I picked up some spark plugs for it, I guessed with some Mustang plugs, but they don't fit the holes. Are there any other size spark plugs that are in the same year range, or what am I missing here?
So the other day I picked up some spark plugs for it, I guessed with some Mustang plugs, but they don't fit the holes. Are there any other size spark plugs that are in the same year range, or what am I missing here?
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Thats what I was thinking as well. But why would someone have the older heads on an efi engine. Its going into a Mazda pickup, so thats no help. I did put a new Edelbrock carb intake onto it though, so I know that it is a 302, that and I have the 5.0 HO intake plaque on my toolbox.
The spark plugs actually look like they are too large for the holes, not too small.
The spark plugs actually look like they are too large for the holes, not too small.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
2 possibilities... You may have a plane jane 5.0 with E6 heads or a cobra/explorer 5.0 with GT40p heads.. lets hope for the latter, and both these heads use special small diameter plugs. The GT40p heads are easily identified by the letters GTP cast into the front outside corner of one of the heads and 4 vertical bars on the front face. The E6 heads will have a capital S in the same location.
Post Fiend
Joined: Nov 2005
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From: Charles Town, W bygod Va
My D0oe heads take the bigger plugs, I wasnt aware of a smaller one out there. Anyone know what the diamater is on those plugs. I know most are 14x1.25
Edit: found the big ones are 18mm
Edit: found the big ones are 18mm
FTE Legend
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From: Ottawa, Ontario
Yes. The E6 heads were one of the worst ever produced for these motors depending what type powerband you want. They are great at producing TQ but are too restrictive to make anything close to respectable HP without a complete porting job, but that's still money and time wasted.
E6SE and GT40 heads take a 14mm plug with 0.708" reach.(Motocraft AGSF32C)
E6SE and GT40 heads take a 14mm plug with 0.708" reach.(Motocraft AGSF32C)
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Cargo Master
Joined: May 2007
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From: British Columbia
The older spark plugs are 18 x 1.5 thread. They were used on sixes and V8s up to the mid 70s, except for Clevelands which always used the smaller thread plugs.
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Well that was easy to take care of. I went on my local Mustang site, and found a guy selling his E7 heads with under 70,000 km on them for $30 complete. Now from what I've read so far, I should be just fine with the flat top pistons with the E7 heads, correct?
If I needed new pistons, I would end up boring it a bit and going up to a 306 or so, and then I would need a new wife.
If I needed new pistons, I would end up boring it a bit and going up to a 306 or so, and then I would need a new wife.
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