[miker98038]

I’ve used NGK’s for probably since the early 70’s when they came to the US. OT engines, stock engines, highly modified high compression, supercharged (centrifugal, Roots, turbo’s), everything but nitrous. For me they just worked. They are what’s in my current Yblocks.

The original claim was a wider functioning heat range. They were what the racers where using and what my builders recommended. That’s still true. So I was glad to see Ted Eaton’s response confirm my experience. This was before offshoring our usual choices.

Find the cross reference and there you go.