Mark, if you read the reference to 'heat range ' etc one make of plug is usually better than another only because its range is in line with the requirements of the engine...so again any make is fine as long as that heat range is correct...and just to rub it in , when did anyone on this forum buy/ask for an aftermarket plug by giving its 'range' eh!!1 I doubt it bud!(PS I've seen hundreds of spark plug tests on dyno cells in Ford Dunton ,trust me brand X is as good as Brand Y if its range is correct!
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