What spark plug to use??

[Brad003]

I have a 02 Harley Davidson f150 with the following mods:
8lb lower
Sbtb
Cai
Lightning upper
Cat back exhaust
And a 69.4in belt
Mafia maf
Sct tuner
Ported blower and plenum(about to install)

I went to tune and dyno it and it miss fired at 75mph. So got to change plugs out and go again. Should be pushing roughly 440rwhp 550rwtq when ported blower and plenum is installed. What plugs should I run and at what gap? My tuner said .026-.028 but nothing bigger. But didn't tell me a plug to use. Any ideas and does that number sound right for the gap?

 

[CBailey]

NGK TR6 plugs are the plug of choice for modified Lightnings and H-Ds. In your case, a plug gap of .032" would be correct.

 

[svtl399]

I second the NGK TR6 plugs! What I run in my L and my HD truck

 

[RedfireSVT]

like the others, NGK Tr6

 

[jokerzL]

Tr6 at .032