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TR4/4A TR4 Spark Plugs

I have used Champion L89Y and NGK, I can't say I can tell any difference in driving the car.
Since a number of upgrades including higher compression ratio I have used NGK BP7ES, one heat range cooler than the 6.
Simon.
 
[ QUOTE ]
I have used Champion L89Y ....

[/ QUOTE ]I'm curious: is there such a thing as an L89Y plug? That would be hotter than the "normal" L87Y. I've actually taken to using, with great success thus far, L82Y plugs in my, uh, Herald (ok, it takes the same plug)! /ubbthreads/images/graemlins/grin.gif
 
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