What spark plugs are you guys running in your 408 strokers?

BrianT said
Not many people are answering the OP question. He didn't ask what brand was your favorite, he asked what plug for his application? I'm going to be needing to pick a plug pretty soon and need to know what specific plug works best in an aluminum headed 408 similar to his build in the original question? I had NGK's in the 340 without any trouble.

Which what I was trying to convey, its not brand that really matters a whole lot, its heat range vs compression and readablility.
A gold/silver finish plug will be easier to read.

flyfish said
I use NGK R5671A-7 in my 410 stroker (Edelbrock heads, 10.89:1 compression). I have also used their -8 plugs (which are 1 step colder), but they foul quicker in my motor.

....And a plug that's too cold a range will foul.