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A load of my mates were in to Banger & Hot Rod Racing 'The Bexley Suicide Squad' in Mick's Hot Rod the Ford Pinto lump had such high compression we painted a line on the ceramic in line with the electrode so when you put them in it had to face within the top half because if it faced down the piston tapped the electrode shut :)
Doesn't that usually mean a spark plug/fueling issue?
Stoopid question but have you indexed the spark plugs? http://www.enginelabs.com/news/getting-the-most-out-of-your-ignition-spark-plug-indexing-101/