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stillen did a back to back dyno test run on 3 different vehicles at a meet I went to about plug indexing and it showed on average about a 3hp gain on
a V8 and right around 1hp gain on a inline 4..
this was when I lived in CA..
I too brought up the thing about the compresion ratio with shims, ect..
they said it wouldn't change the cc's at all and if any change were made,
the indexed plugs would more than make up for the ever so slight change..
point the plug gaps to the exhaust..
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