Bosch X270P21 RSR spark plugs

[matteo68]

Looking for a NOS set of 12.

An old thread here includes photos of them:

https://www.early911sregistry.org/fo...hlight=X270p21

[gled49]

It’s time to move on, those are obsolete and were replaced by XR2CS (silver) and those are now not available. I moved on to NGK DR9EIX, their 12mm plug. 9’s are pretty cold about the same as the old 270.

[matteo68]

Ah thanks for that. My engine builder said exactly the same thing, plus they foul up quickly when not racing. He suggested NGK too!

[OliveR]

If not only racing use, I would recommend NGK 8 grade, plus if you're located in a rainy/cold country

[matteo68]

...which I am! But wish I was in San Diego...

I think I'll leave this detail to my man actually (too much time spent pouring over Info for Sports Purposes & Competition Spare Parts List! )

[Yellow491]

Looking for a NOS set of 12.

An old thread here includes photos of them:

https://www.early911sregistry.org/fo...hlight=X270p21

I have several sets,never had any issues,quite a few nos in boxes if you need them,im in the uk.

[matteo68]

Ah cool, I’ll send you a PM, even though I am going to use NGK 8’s - I like to collect all the period-correct parts even if I don’t actually use them.

[Yellow491]

R your heads converted to 12mm?i will see if i can dig them out.

[matteo68]

Yes, I believe they are (or will be). I have sent you a PM.

I was with Russell Edmonds today and he agreed that it's definitely worth stillhaving the original plugs and other parts which may have been superceded by later parts.