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Discussion Starter · #1 ·
Credit given to ALLMTR2V on the corral forums.

MOTORCRAFT
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK
TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Colder
BP7EFS (PN - 3526) BR7EF (PN - 3346) two steps
R5724-8 (PN - 7317) two and a half steps
R5724-9 (PN - 7891) three steps
R5724-10 (PN - 7993) four steps

AUTOLITE
764s / Stock
103s / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION
YS-59C / -3 or -4 below stock heat range

DENSO
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range
 

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Got the same info from MPH as well...I posted it in the 99-04 section...This is for the V8 Mod Engines...
 

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I run the NGK plug (TR-6's) and haven't had any problems out of those. I change them after about every 5-6 bottles...Just in cases!
 

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I worked for Autozone a while back, and almost every single Bosch +2 or +4 that we sold, the customer almost always came back with fouled plugs, check engine light on w the car miss-firing. I don't know if the plugs are poorly made or what. -DaNnY-
 

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Credit given to ALLMTR2V on the corral forums.

MOTORCRAFT
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

Motorcraft sparkplugs have changed part #'s and some are now only aval in a full thread design, new part #'s are as follows......

SP-447 replaces the AWSF-32-C & AGSF-32-C, Full Thread design-stock heat range in a copper core
SP-505 replaces the AWSF-22-C & AGSF-22-C, Full Thread design-1 step down from stock, also copper core
SP-494 replaces the AWSFA-12-C still a 1/2 thread design-2 steps down from stock, copper core
 

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so wats best for 96-98 cobras...wat plug will give it like .8mpg or .8h.p...haha...wat plug is the best for these cars?
 
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