O.K. To run a DPR8Z spark plug?

[canadian400ex]

I'm almost sure it is but I just want to be 100% before I pop it in!
Stock is DPR9Z, but my local shop had a DPR8Z in stock so that should be fine, correct?
Thanks.

[Chef]

Stock on my 99 is DPR8Z...it is perfectly fine to run it..

[ChadEXer]

The 8 is the stock plug,,,9 is a colder plug and most of the engine builders say its good for your motor! The plug on the 400EX is close to where the valves seat and the cooler plug helps them last longer!!

[canadian400ex]

Thanks fella's.... I thought the 9 was the stocker.

[lil400exman]

i never knew you guys should move this into the faq forum!