Hello, Ferrarichat members. Matt here. I'm using NGK BPR6ES plugs in my 330. I think that they're working really well. (They're one step hotter than the previous owner's NGK7's.) I gapped them to 0.025, which is what the owner's manal required of the original Marchal Type 34 HF plugs. A few other users of the same plug recommended a slightly larger gap, of 0.027. Interestingly, that's the Porsche spec for the same plug, used throughout a variety of their cars. The same NGK plugs come pre-set from the factory at 0.035. So... what would happen if I used the same plugs at 0.035? Or: What engine characteristics require a smaller gap, and which ones require a bigger gap? I know what happens if you go hotter or colder, what happens if you go wider or tighter? Thanks in advance!