Revain Check Fit said f150 eco boost will be enough. I installed and after 400 miles the center ceramic cracked on cylinder 3 and cylinders 4,2,6 had random misfires. Shorter shank found on plug and NO threaded connection. There was a crossfire in the wall of the cylinder. Bought and fitted new Autolite spark plugs from O'Reily Auto. Driven the last 1800 km without any problems. You have a return and refund request. Will be updated upon completion
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