Spark Plug for 1997 Cobra S-Trim (20lb pulley)?

1997 Cobra S-Trim (20 lb pulley) non-intercooled, 4.10 gears.

Plug in there now, NGK TR6 (V Power). Advanced Auto Website says this ain't the right plug! It's been in there for years. Had motor work by previous owner, so I dunno.

Advanced Auto says to use NGK TR55

And what should the PLUG GAP be for this setup?

Thanks for any help.

NGK TR6 is a cooler plug that allot of people that are boosted run. Just get the same plug and gap it somewhere between .30-.32.

Like Dave said, they are not the factory heat range plug. But they are what you need for boosted applications. Running them in my 98 Cobra (.034) with 10lbs and my 03 Cobra (.032) with 18lbs.