Originally Posted by blue thunder (Post 2555812)

Interesting. I was running r43xls last yr NA. Per Laz's method it looks like 2 turns of color on those plugs, so a tad cool. This yr I am running 4lb boost so I wanted to go 2 sizes cooler than the 43s to 41s. Those I could not find, so I went to the NGK site and crossed it to an NGK plug. I found the equivilant plug to be a BPR5EA - L - 11 per their site. It seems that 8s would be too cool, but I don't know. Take it for what it is worth LS!.

Originally Posted by DMOORE (Post 2556127)

Man, a #5 seems REALLY hot for a blower motor. Sure the cross reference is correct?


Darrell.

Originally Posted by blue thunder (Post 2556847)

No, I am not sure. So I called NGK. They said you can't trust the distributor cross ref sites. Holy Shiet! They recommended 7s or 8s. I ordered race series 9s to replace these 5s. Thanks for the heads up before I started breaking stuff DMoore! :hitfan:.

Originally Posted by axapowell (Post 2555855)

Frank,

I have basically the same motors with a similar set-up and I have tried both the "9's" and "8's". I have found the 8's run cleaner and the read is good.

Dave

Originally Posted by ls1nova (Post 2558775)

Thanks for all the input guys. I talked with the ngk tech line and they suggested I start off with a 6 and go from there. I actually ended up getting 7's to start with, but I have a feeling I may end up with 8s in there.

Frank