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I have a Roush 351W stroked/bored to a 427cu and MSD 6AL , 510HP.
Roush recommends for my engine Autolite AR3923, heat range 3 (one heat range cooler that 3924) .. however I have better luck using NGK's so I use the equivalent NGK BKR6E-11, heat range 6 (stock #2756) just as "spbrake" recommends.
I also gap my plugs to ~0.045" because of the MSD 6AL.
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Many thanks,
Mark
Superformance: SPO2454 , Titanium w/Black Stripes
Engine: Roush 427SR w/770cfm 4-Barrel Holley
Transmission: Tremec TKO-600
Last edited by Moritz55; 02-09-2021 at 07:26 AM..
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