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what the best spark plugs for boost?

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Old 03-06-2011, 03:37 PM
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Default what the best spark plugs for boost?
any suggestions?
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Old 03-06-2011, 06:22 PM
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TR-6 gapped at .035
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Old 03-06-2011, 07:05 PM
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Ngk BR7EFS .035 gap after countless hours or research, its a colder plug than the Tr6 which means safer plug
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Old 03-06-2011, 10:45 PM
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with no information on the setup how can you recommend a plug ?

we need to have a sticky with plug numbers / boost and nitrous levels like on tech . this questions is asked way too often.
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Old 03-06-2011, 11:03 PM
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Originally Posted by 2004SSS
with no information on the setup how can you recommend a plug ?

we need to have a sticky with plug numbers / boost and nitrous levels like on tech . this questions is asked way too often.
good idea!
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Old 03-06-2011, 11:05 PM
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we should make the search button larger.
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Old 03-06-2011, 11:09 PM
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oh **** here we go . i posted a similar one earlier .

someone make this a dam sticky

LS1 Stock and AFR
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .060
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Denso IT-16 (stock number 5325)

Nitrous (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)

Nitrous (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)

Nitrous (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)

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

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


LS1 w/ Edelbrock and Dart Heads
Thread – 14mm
Reach – 3/4”
Socket – 5/8 hex
Seat – Gasket

Stock – MFG Recommendations: approx under 9:1 compression
Heat Range: 4
Gap: Consult ignition mfg.
Plug: NGK FR4 (stock number 5155); NGK BKR5EIX (stock number 6341); Autolite 3926; Champion RC12YC (stock number 71); Denso IK16 (stock number 5303)

MFG Recommendations: approx 10.5:1 compression
Heat Range: 5
Gap: Consult ignition mfg.
Plug: NGK FR5 (stock number 7373); Autolite AR3924 (Racing Plug); Autolite 3924; Champion RC9YC (stock number 2075); Denso K20PR-U (stock number 3145); Denso IK20 (stock number 5304)

MFG Recommendations: approx 11:1 compression
Heat Range: 8
Gap: Consult ignition mfg.
Plug: NGK R5672A-8 (stock number 7173); Autolite AR3911; Champion C63YC (stock number 796); Denso IQ24 (stock number 5314)

MFG Recommendations: approx 12:1 compression
Heat Range: 9
Gap: Consult ignition mfg.
Plug: NGK R5672A-9 (stock number 7405); Autolite AR3910; Champion C61YC (stock number 785); Denso IQ27 (stock number 5315)

MFG Recommendations: approx 13:1 compression
Heat Range: 9 - 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-9 (stock number 5238); Autolite AR3933; Champion C59CX (stock number 296); Denso IK27 (stock number 5312)

MFG Recommendations: approx 14:1 compression
Heat Range: 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-10 (stock number 5820); Autolite AR3932; Champion C57CX (stock number 295); Denso IK-31 (stock number 5321)

**NOTE: Use chart for static compression and adjust heat range for nitrous use accordingly.
i know it doesent specify a hp amount or shot size but you should get an idea on the heat range you need for power output .

>600 hp - 6 heat range
>800 hp - 7 heat range
>1000hp - 8 heat range

from what i have read this is close but if someone with experience would please chime in to get that info based on facts it would be nice.
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Old 08-17-2013, 07:56 PM
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Now what about boost lol... say 8lbs
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Old 08-17-2013, 08:40 PM
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ngk tr6
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Old 08-17-2013, 09:26 PM
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I have a gauge for that
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0-12lbs, ngk6
12-18lbs, ngk7
18+, ngk 8
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