What spark plugs to use???

[k2steve]

New to the forum and this is my first post. Awsome site.
Does anybody have a starting point Idea of the plug to use in a
340 stroked to a 416 with 9.5 : 1 compression with w2 iron heads.

I am thinking a hotter plug like a Champ n12y but I don't know. Has anyone tuned any stroked engines ? Let me know please. Thanks in advance.................
Steve
70 Challenger

[AtomicWedgie]

NGK I don't anything about hotter or colder but alot of the guys I race with and talk to use NGK

[DTCMMLF]

Back in the day, I ran N-10-Y in my Hemi and small blocks, using leaded Sunoco 360 fuel. Check the N-10-Y/N-12-Y and N-14-Y series from Champion... There are probably newer plugs out that cover a multitude of applications for todays fuel mixes and such. Good Luck!

[k2steve]

Thanks