Can anyone recommend a spark plug for use in a 489 BBC stroker with 108cc closed chamber heads (cast# 3964291) flat top pistons, and 10.4 to 1 compression.

Thanks graemlins/beers.gif
71 Chevelle SS

Stock 396 here, NGK BP5ES. So maybe a step colder. I'm no expert, more like a 'BUMP' :D