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Best Spark Plug For 440 Source Head

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.
 
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