KY Nova

iTrader: (1)

This is my first LS and Procharger build and i need to know which spark plug to put in it to start with. It's a 9.5 to 1 402ci with stock 243 heads. It's got a F1A that is suppose to make somewhere around 14-16psi, running 93 octane with a AIS w/meth dual nozzle setup. Stock computer. If more info is needed, let me know. I picked the engine up today and they forgot to include the cam card in the info, all i know is they said it's right under .600 lift.

Thanks
Allen

Bob@BruteSpeed

iTrader: (16)

NGK TR6 pn# 4177 gapped at .032. Bob

I8UR4RD

iTrader: (16)

I am starting off with BR7EFS @ .027 on mine but most likely at our power levels I will go ahead and put 8's on it. They may foul out quicker, but its not like I wont be pulling plugs anyways. Plugs are cheap. motors are not.

KY Nova

iTrader: (1)

Bob, I should of thought to ask you, as you always seem to have the answers i need. Thanks again #276. LOL How does the number system work for heat rating on them, smaller=?.

I8u4rd, I've been watching build as is somewhat similar as mine with alot more flare. Thanks for info.

KY Nova

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I should have added they just stuck some Autolite AR 3932's in it to fill the holes for the haul home. Are they any count for this app?

oange ss

iTrader: (50)

3932 are comparable to NGK #10 plug, pretty cold for a street car, you could run them but would probably foul pretty quick...my .02

T76s10

iTrader: (6)

i used tr6's with no problems but recently going to try br7ef's

Detoxx03

iTrader: (14)

I would run the non projected tip plugs like a BR7EF.

KY Nova

iTrader: (1)

Thanks again to everyone. May sound dumb, but what brand are the BR's you and others have mentioned?

Bob@BruteSpeed

iTrader: (16)

I've never had problems with the TR6's, we've run a lot of cars with them including mine at 18 to 20 psi of boost. Below is a heat range listing. Bob


One step colder
Heat Range: 6
Gap: .035 - .038
Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)

Two steps colder
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)

Two and a half steps colder
Heat Range: 8
Gap: Consult
Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (part number 3691); Denso IT-24 (stock number 5328)

Three steps colder
Heat Range: 9
Gap: Consult
Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27

Four steps colder
Heat Range: 10
Gap: Consult
Plug: NGK R5724-10 (stock number 7993); Autolite AR92

KY Nova

iTrader: (1)

Awesome Bob. That really helped.

Bob@BruteSpeed

iTrader: (16)

http://www.google.com/url?sa=t&rct=j...45960087,d.cGE

The TR6 plugs worked very well in my Camaro, shown here. Bob

Detoxx03

iTrader: (14)

NGK part #3346

KY Nova

iTrader: (1)

Hey guys, i appreciate the help. I'm going to get a few sets that you all have mentioned(tr6, bre7's) to have when i take it to get it tuned just so i have options. This place and you guys are saviours.

oange ss

iTrader: (50)

I used BR7EF initially @15 psi with E85, but switched to TR6 for better idle quality... I think you can get away with a little hotter plug on E85