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Which spark plugs for Turbo

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Old Feb 5, 2011 | 02:31 AM
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Default Which spark plugs for Turbo
i have this Turbo motor and i want to buy the proper spark plugs for the motor but i do not know which one to take ,need your input :

-LS3 416ci
- Garrett Gt-91
-Eldrbrock 245 heads WCCH
-Boost will be 18-23 lbs
-120-160 lbs injectors

BR7EF ,NGK TR6 ,TR7,......
what is the best choice ?
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Old Feb 5, 2011 | 08:43 AM
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I'd go with at least a 7 heat range plug (BR7EF). Possibly even an 8.

TR6 is going to be way too hot by most peoples standards.
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Old Feb 5, 2011 | 09:21 AM
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NGK B8EFS (stock #1049) / Autolite AR474 for starters

NGK B9EFS (stock #1085) / Autolite AR473 for another step colder
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Old Feb 5, 2011 | 10:34 AM
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do those heads require a .750 or .705 reach and gasketed or taper seat?
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Old Feb 5, 2011 | 10:41 AM
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taper seat
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Old Feb 5, 2011 | 10:55 AM
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Originally Posted by lt1773
taper seat
Which reach do those heads require?
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Old Feb 5, 2011 | 02:34 PM
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Originally Posted by Phil99vette
Which reach do those heads require?
Stock style/length I believe.
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Old Feb 5, 2011 | 02:55 PM
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Originally Posted by NicD
Stock style/length I believe.
You cant assume, call and find out. Most aftermarket heads require 3/4" reach.
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Old Feb 5, 2011 | 03:22 PM
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Originally Posted by Phil99vette
You cant assume, call and find out. Most aftermarket heads require 3/4" reach.
C'mon this isn't difficult, look on their website they specify factory style/length like a TR55 just like AFRs do.
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Old Feb 5, 2011 | 04:37 PM
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Originally Posted by NicD
C'mon this isn't difficult, look on their website they specify factory style/length like a TR55 just like AFRs do.
Your right this isn't that difficult so buy whatever plugs you want. You asked for the correct ones. AFR requires a 3/4" reach plug and the TR55s are .691. Factory heads dont use a .750 reach plug while most if not all of the aftermarket ones require a .750 reach.
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Old Feb 5, 2011 | 04:54 PM
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TR7s...
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Old Feb 5, 2011 | 04:57 PM
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Originally Posted by Phil99vette
Your right this isn't that difficult so buy whatever plugs you want. You asked for the correct ones. AFR requires a 3/4" reach plug and the TR55s are .691. Factory heads dont use a .750 reach plug while most if not all of the aftermarket ones require a .750 reach.
I guess I don't understand the pissing match. He can use the regular OE style taper seat plugs just like you can with an AFR head or a stock head depending on how far he wants the plug to project in the chamber and as far as I'm concerned pulling the tip out of the chamber is preferred for the build he is doing which is why I suggested the plugs I did. He asked for suggestions on a place to start and you are making a big deal out of something pretty inconsequential but whatever.
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Old Feb 5, 2011 | 04:58 PM
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Since you asked for the correct plug.

After 2 minutes of searching, the edlebrock head uses a .708 x 14mm tapered plug. Get the Autolite AR94 racing plug.
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Old Feb 5, 2011 | 05:08 PM
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Originally Posted by Phil99vette
Since you asked for the correct plug.

After 2 minutes of searching, the edlebrock head uses a .708 x 14mm tapered plug. Get the Autolite AR94 racing plug.
An AR94 is just a projected tip version of the plugs that I listed in the first place with damn near identical lengths. Personally I don't run projected tip plugs on any bigger power build but that's just my preference.
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Old Feb 5, 2011 | 05:10 PM
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Originally Posted by LSXFORMULA99
TR7s...
There is no such plug.
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Old Feb 5, 2011 | 06:14 PM
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Originally Posted by NicD
There is no such plug.
Just installed a set 3 day ago.
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Old Feb 5, 2011 | 06:20 PM
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Originally Posted by mike13
Just installed a set 3 day ago.
Oh really, what was listed on the box and what's the NGK stock number? NGK doesn't refer to any 7 heat range or colder copper plug as a TR anything.
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Old Feb 5, 2011 | 06:31 PM
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Originally Posted by NicD
Oh really, what was listed on the box and what's the NGK stock number? NGK doesn't refer to any 7 heat range or colder copper plug as a TR anything.
It said TR7 on the box, I ordered them from Nasty with MSD wires.
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Old Feb 5, 2011 | 07:08 PM
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Originally Posted by mike13
It said TR7 on the box, I ordered them from Nasty with MSD wires.
Show me a picture, I would bet it says BP7EFS on the box since a TR7 doesn't exist.
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Old Feb 5, 2011 | 07:13 PM
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Originally Posted by NicD
Show me a picture, I would bet it says BP7EFS on the box since a TR7 doesn't exist.
i used tr7's also. u suck!!!
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