Randy Wilson
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Looking for opinions on which is the best spark plug for 440 Source cylinder head applications.
Best Spark Plug For 440 Source Head
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Justasgood
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440 Source has plugs. Call em and ask. Very helpful folks there.
Randy Wilson
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I am looking for something other than the Champion spark plugs they carry. Thx
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Plug selection has to do with your engine dynamics.
What plugs are you running now?
33 IMP
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Get the number of 440 source champions, and a cross-reference for the brand you want from a parts store, or maybe even Google.
Then pick a heat range for your engine combo and driving style.
Then pick a heat range for your engine combo and driving style.
70runner
Well-Known Member
Reference point, 440-6 with stealth heads, Lunati 60303, SRP 10.5 pistons, SCAT H rods, stock int/exh manifolds, 10.2 CR, 727, 3.23 suregrip: NGK BPR5E works well with this setup.
Randy Wilson
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What heat range is a BPR5E
451Mopar
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Don't forget to get a low profile spark plug socket for the #4 spark plug (if a 440 in a B-Body): Loading...
NGK Spark Plug Chart: https://www.ngk.com/ngk-spark-plug-numbering-systems
I use the shorter ISO height spark plugs, length from seat to plug wire tip = 50.5mm or 1.98" long. In NGK terms, the Shell = "BK"
The longer JIS height, NGK Shell = "BC" is 53mm or 2.086" long.
Either will work as we don't have coil-on-plug ignition coils like many new cars.
Link to the difference in length: https://www.ngk.com/iso-vs-jis-spark-plug-heights-2
Both the "BC" and "BK" shell are 5/8" Hex socket size. The "B" shell is the larger 13/16" Hex socket size.
I do use the "5" Heat Range in the 440 stroked to 505" with the Stealth Heads, 10.3:1 compression and Hydraulic Roller cam. The 400 stroked to 499" with Victor MW heads, 12.4:1 Compression and solid roller cam engine uses a colder "7" heat range plug.
In NGK Numbering System, I use a "BKR5E" The Stock Number NGK7938 is the 0.035" pre-gapped spark plug.: https://www.ngk.com/ngk-7938-bkr5e-v-power-spark-plug
The "BKR5E-11" is Stock Number NGK6953 and pre-gapped at 0.043": https://www.ngk.com/ngk-6953-bkr5e-11-v-power-spark-plug
Looking this up, I noticed they also have a BKr5ES plug, same as above (Part Number NGK2460 0.035" gap), but Nickle electrode and $0.18 less per plug? I never used one of these? Might be longer life? Fitment says Bently Amage, or KiA Optima?: https://www.ngk.com/ngk-2460-bkr5es-nickel-spark-plug
NGK Spark Plug Chart: https://www.ngk.com/ngk-spark-plug-numbering-systems
I use the shorter ISO height spark plugs, length from seat to plug wire tip = 50.5mm or 1.98" long. In NGK terms, the Shell = "BK"
The longer JIS height, NGK Shell = "BC" is 53mm or 2.086" long.
Either will work as we don't have coil-on-plug ignition coils like many new cars.
Link to the difference in length: https://www.ngk.com/iso-vs-jis-spark-plug-heights-2
Both the "BC" and "BK" shell are 5/8" Hex socket size. The "B" shell is the larger 13/16" Hex socket size.
I do use the "5" Heat Range in the 440 stroked to 505" with the Stealth Heads, 10.3:1 compression and Hydraulic Roller cam. The 400 stroked to 499" with Victor MW heads, 12.4:1 Compression and solid roller cam engine uses a colder "7" heat range plug.
In NGK Numbering System, I use a "BKR5E" The Stock Number NGK7938 is the 0.035" pre-gapped spark plug.: https://www.ngk.com/ngk-7938-bkr5e-v-power-spark-plug
The "BKR5E-11" is Stock Number NGK6953 and pre-gapped at 0.043": https://www.ngk.com/ngk-6953-bkr5e-11-v-power-spark-plug
Looking this up, I noticed they also have a BKr5ES plug, same as above (Part Number NGK2460 0.035" gap), but Nickle electrode and $0.18 less per plug? I never used one of these? Might be longer life? Fitment says Bently Amage, or KiA Optima?: https://www.ngk.com/ngk-2460-bkr5es-nickel-spark-plug
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