Spark plugs for BBM heads

[bsprowl]

I paln to CC my BBM heads but then realized they use a smaller spark plug than the one in the stock heads.

So what plugs shold i be getting for track use.

And I just realized the plugs I've been saving (including a a set or two of Holley spark plugs) will be of no use to me - lol.

[Tunnelwedge]

Cheap, Autolite 3924
More expensive, NGK BKR6E

[Jb427]

I run the NGK BKR6E seems to work well for me with 11.3/1 CR

[blykins]

What's the compression ratio gonna be?

[bsprowl]

Compression ratio is unknown, that's why I'm ccing the heads.  I'm guessing 10.5, hoping for 11.5, would be delighted with 12.5.

[blykins]

The plug will depend on the compression ratio.  I run 10-11 on Autolite 3323’s and 3324’s.  Higher than that, I usually switch to a colder plug, like a 3910 or similar.