+3 Set of 8 Spark Plugs For Mercruiser 305 350 454 5.0L 5.7L 7.4L Boat KB-MR43T $29.95 In stock Quantity: 1 Add to Bag Product Details Cross Reference:: 19157985 19355200 Gap Size 0.040" (Mercruiser Spec tag on engine may call for 0.035") Ground Electrode Core Material Nickel Alloy Center Electrode Core Material Copper Center Electrode Tip Material Nickel Alloy Ground Electrode Quantity 1 Hex Size 13/16in Manufacturer Heat Range 3 Approximate Resistor Value 2-12k ohms Seat Type Tapered Reach 0.43 IN Reach 10.95 MM Thread Diameter 14 MM Save this product for later Favorite