Best Spark Plug For 440 Source Head

Looking for opinions on which is the best spark plug for 440 Source cylinder head applications.

440 Source has plugs. Call em and ask. Very helpful folks there.

I am looking for something other than the Champion spark plugs they carry. Thx

Plug selection has to do with your engine dynamics.

Randy Wilson said:

Looking for opinions on which is the best spark plug for 440 Source cylinder head applications.

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What plugs are you running now?

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.

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.

NGK '4' heat range. 5 if drag raced. Cross reference the Champion to NGK.

What heat range is a BPR5E

'5'. Do you mean BPR5ES?

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