Subaru LEGACY 2002 Quick Reference Index page 175

2. Spark Plug
The spark plug's thread diameter is 14 mm (0.551 in) and the gap is controlled to either of the di-
mensions shown below.
(1) Gap : 1.0 – 1.1 mm (0.039 – 0.043 in) *1
SPARK PLUG
(1)
0.7 – 0.8 mm (0.028 – 0.031 in) *2
*1: With catalytic converter
*2: Without catalytic converter
IG-3
Ignition
B2H4152C