Phil99vette

iTrader: (11)

Whats the general rule of thumb for selecting spark plug heat range? We're trying to find a good plug for a 346 - 23x-24x cam ~11.6:1 CR making 485-505rwhp. I am leaning towards iridium "6s". And no this is not my motor. We're running TR7IX in mine.
Phil

orangeapeel

iTrader: (18)

on my 244/248 cam I have a .050 gap. If that helps.

Mr. Luos

iTrader: (9)

Running TR55's gapped .045 in my 402 with a 248/254 629/622 113. 11:1.
I might be wrong though...but I just went with what worked before.

PREDATOR-Z

TR6's gapped .042>.045

Phil99vette

iTrader: (11)

If you guys could post your RWHP numbers that would be great...Hopefully this will end up as a sticky.
Phil

PREDATOR-Z

RWHP have little to do with plug choice. DCR, SCR and fuel used are the determining factors.

Phil99vette

iTrader: (11)

Very very true