Would like to know what would be the best spark plug + gapping for a 331 stroker with AFR heads and MSD 6AL box with stock coil. I'm also running an Edelbrock RPM Perf II intake if that makes any difference.
Took the current plugs out and they are NGK R5671A-7 racing plugs (Platinum V tips). Don't know anything about these plugs and they're not listed for Ford small block use. They we're installed by the guy who built this motor so I guess he knew what he was doing