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Title: gt40 plugs
Post by: JAMEZILLA on October 28, 2006, 03:17:52 PM

Does anyone know what plugs fit the cast iron GT40 heads? Any name brand/# will do as a cross reference, just installed'em now gonna need plugs ( after the rockers, intake, etc. , of course!)This is on my 88 S motor to HO conversion ( still have the flat tops)

Title: Ifound it
Post by: JAMEZILLA on October 29, 2006, 02:28:44 PM

I went scrounging around & through Summit I got a tech support guy, Gary, on a SATURDAY! I'm impressed, that's pretty good customer service on both ends. Anyway the MOTORCRAFT application is ASF-32C- platinum w/ .054" gap!

Title: gt40 plugs
Post by: thunderjet302 on October 29, 2006, 08:49:42 PM

Cool. I'm puting a GT-40 headed 5.0 HO in my T-bird in the spring and I was wondering what plugs to use.

Title: gt40 plugs
Post by: Innes on October 30, 2006, 06:46:46 PM

or when you go to the auto store ask for plugs for 93-95 cobra or 96-97 explorer/moutaner

Title: gt40 plugs
Post by: Blown306Cougar on October 30, 2006, 08:35:45 PM

autolite 3924's

and i would'nt gap them @ .054 on less it's a bone stock SO motor..

for a N/A motor under 10.0to1 gap the plugs @ .044

for a N/A motor with 10.0to1 comp or more .035

for a supercharged motor like mine .035

for a supercharged or turbo motor @ high levels of boost as low as .025 but will take some trial and error for best resolts..

Nick

Title: gt40 plugs
Post by: JAMEZILLA on October 31, 2006, 03:09:58 PM

The explorers were gt40 P heads and took different plugs, and those heads ain't quite the cobras.9o

Title: gt40 plugs
Post by: Blown306Cougar on October 31, 2006, 08:42:08 PM

figures it's the only performance that does'nt use them.. :cool:

motorcraft
AWSF-32C

autolite
764

heres a link

http://www.stangpro.com/html/articles/gt40p_files/gt40p1.htm

Nick

Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: JAMEZILLA on October 28, 2006, 03:17:52 PM