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Road/Race recommends NGK BKR7E spark plugs when running big boost on the GTX. According to owner Mike Welch, their gap is also critical and should be set between .028 and .030.
Project Mazda 323 GTX: Part 4

Road/Race recommends NGK BKR7E spark plugs when running big boost on the GTX. According to owner Mike Welch, their gap is also critical and should be set between .028 and .030.  View Related Article

 

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