Somewhere along the line I've inherited a set of 4 of these. Searched by this part number on Google and this forum. Best I could find was a comment from our old friend Guitarjunkie (gift that keeps on giving it seems) in response to the question what the proper gap should be for B8EVK's follows:

"depends on how much boost, rpm and all that...

the stock ngk plugs have something like a .050 gap. try a .040 and close it up a little if you start running dodgy in the top end.

i used b10eix in my turbo bridgeport and ended up with a .030 leading and .040 trailing. that motor spun 8400rpm"

Anyway, what I'm trying to determine is what is the equivalent application for these Platinum NGK's. I'm guessing you would use these for both leading and trailing in place of NGK BR9EQ/<LABEL for=cb_optionnumber_2>NGK BR7EQ if you have upgraded your TII engine management in some way.</LABEL>
<LABEL for=cb_optionnumber_2></LABEL>
<LABEL for=cb_optionnumber_2>Comments, observations, experiences?</LABEL>

 

^

 

toss them, there's no point. they're not even resistor-type plugs. a modified turbo Rx-7 should be running 9 heat range minimum in both leading and trailing