I found this on horsepowered forums, its already been snaked over here, BITE ME!

Modular Spark plug list!
This list was originally started by ALLMTR2V on the corral and alot of people helped to get it right. I thought it would be a good addition to the MD!

MOTORCRAFT

PART# / HEAT RANGE
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

PART# / HEAT RANGE
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

PART# / HEAT RANGE
764s / Stock
103s / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION

PART# / HEAT RANGE
YS-59C / -3 or -4 below stock heat range

DENSO

PART# / HEAT RANGE
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range

Scott

very nice. comes in handy right now as im about to buy new plugs



I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26

hypsy wrote:very nice. comes in handy right now as im about to buy new plugs

but those are for Mustangs

4.6L 2 valve motors specifically



I ain't callin u a gold digga,but you ain't messin wit a broke cracka

oddly enough though the 4177 are the same ones that we use on FI and NO2 cars.



I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26

good deal...............I wasn't aware



I have used that list before.................when I ordered 4 step colder plugs for my buddies mid 10 sec Mustang.



I ain't callin u a gold digga,but you ain't messin wit a broke cracka