BlackGMC

iTrader: (31)

hmmm, well this is odd, cause summit racing says a TR6 is a heat range 6, a TR55 is a heat range 5, and a TR5 heat range 5....

TR6
http://www.summitracing.com/parts/NGK-4177/

TR55
http://www.summitracing.com/parts/NGK-3951/

TR5
http://www.summitracing.com/parts/NGK-2238/

BlackGMC

iTrader: (31)

oh nevermind, i just reread what your wrote.... I am talking TR55 vs TR6.... not a TR5 vs TR55.. But a TR6 is a colder plug than TR55....


why did you bring up TR5???

1slow01Z71

iTrader: (36)

Colder plug will get your more timing

Good read on plug selection
http://www.carcraft.com/howto/116_07...eat_range.html

Wheatley

iTrader: (12)

I would personally start with a NGK BR6EF,read the plugs properly and go from there.
The plugs will tell you what the engine needs/wants

fastrt

iTrader: (48)

I ran those in my 5.3 H/C/I 10.6:1 with a 100 shot. ran damn good. I think N/A I would run TR6 cause it puts the spark out in the combustion chamber farther than the br6ef no-projected plugs. On the bottle, deff go BRxEF plugs. The BR6 is special order plug most times.

True, thats why the TBSS guys run them n/a

Wheatley

iTrader: (12)

Yes they are a good nitrous plug,I run them N/A also,does very well and everything looks great.
The main thing to do it read the plugs and look at what the are telling you.

krambo

iTrader: (4)

I daily drive this plug N/A with my 408 and the engine really seems to like it over any other plug. If I know I will be spraying a small shot, I throw the BR7EF plugs in and daily drive those which seem to do just fine as well. My engine will slowly develop an off idle misfire with B8EFS or B9EFS plugs (after about a hundred miles from new) if I attempt to daily drive them. I can tell a difference in N/A power (lower) with the 8's and 9's but they are really just for the bigger shots of nitrous, not a N/A plug for my application...too cold, can't burn off any deposits leading to misfires.

The recessed plugs seem to perform a little better with the LS6 heads in my N/A application over the projected tip. This is totally my opinion and based only off of SOTP testing.