Hey guys, I am just wondering what the best spark plugs would be for my application. We are in the middle of our build and just to give a short run down of the mods are here. I would like to know what type of V-grooved plugs we should go with OTHER than NGK.

-Hahn stage V turbo conversion
-Port/Polished head
-Custom Comp cams
-Supertech 79lb springs
-Arp head studs
-Cometic Head Gasket
-80lb Siemens injectors
-Return style fuel system
-Walboro Moded fuel pump
-Devils Own Progressive Meth(100% Meth)
-Diamond ceramic top coat/teflon skirt coated pistons
-Total Seal Piston Rings
-3 angle valve job
-Exedy hyper single clutch
-Turbosmart Supersonic bov
-Greedy profec bspec II boost controller(approx 25lb boost we will run)
-HPTuners

Anyhow, I may have left a few things out but what I want to know is what you all think would be a great plug for our application. No offence but I would appreciate only the opinions of very mechanically inclined people only so this doesnt get carried away. We have went over tons of options but I would appreciate your guy's opinions.

 

Why not NGK?

You're really not going to find very many better plugs...

 

Ok, does anybody know where to buy a 2 step colder copper plug for the lsj??

 

You just cant go and get ngk 2 step colder.. they are iridium, which isnt good for your application...

Your going to need to find copper 2 step colder plugs.

 

exactly. the research done by GM at the time on plugs was HUGE and srsly hard to beat stock...

 

Yeah, its fine if they are NGK we just need to find a 2 step colder COPPER plug as I stated.

 

what is wrong with iridium plugs in this application? aside from price

I did a little research and I did find these...
http://www.ngk.com/more_info.asp?AAIA=&pid=2763

NGK R5671A-8, 2 steps colder and copper

 

Iridiums do not do well with boost.

 

NGK does not make a V Power, 8 heat range, resistor plug. You CAN get a v grooved race plug (non-resistor)

R5672A-8 is the part # you want

They DO make a non grooved resistor plug. BPR8ES.



that plug doesn't have a grooved electrode


^ all copper plugs, btw

 

From the link from IonNinja:

Racing Plug, 14mm Thread, 19mm (3/4") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Non-Resistor, Solid Terminal, V-Power (V-Grooved Center Electrode), .032" (0.8mm) Gap, Heat Range 8

 

my bad, just looking at part #'s and pictures

 

What kind of plugs come in the lnf?