Larger than 38900! The Win Tools 389XL Extra Large Spark Plug Thread Repair Kit is specifically designed for situations where parts store inserts have failed, enlarging the hole. It has been proven to work in most cases when a Calvan 38900 kit has failed. This kit serves as a cost-effective alternative to competitive brands that require two inserts per hole, with the 389XL priced at about half the cost. It offers an economical and reliable solution for spark plug thread repairs in Ford 4.6, 5.4, and 6.8 SOHC Two Valve engines. Once the repair is completed, the original spark plug can be used. The 389XL kit features one solid sleeve type insert with the largest outer diameter on the market. The O.D. (Outside Diameter) of the insert on the outer edge of the threads measures 19.90mm or .7840 inches, ensuring a secure and durable repair even in the most challenging cases.

Key Features:

• Line-up Guide: Centers the reamer in the spark plug well.
• Cylinder Leak Tester: Ensures valves are closed before drilling.
• High-Speed Steel Reamer: Specifically designed for aluminum.
• Thread Tap: Prepares threads for the insert.
• Solid Sleeve Type Inserts QTY-8:Largest outer diameter on the market for a secure and durable repair.
• Storage Case: Keeps all tools organized.
• Red Thread Locker: Permanent, high temp, oil-resistant, used on exterior threads of insert.
• JB Weld: Two-part high temp adhesive for under the insert lip.
• Exclusive Tips: Common concerns addressed, included in the package.

With the Win Tools 389XL Spark Plug Thread Repair Kit, helps to reduce vehicle downtime and avoid the added expense of engine disassembly and cylinder head replacement. Helps to ensure stronger threads and a permanent type repair with our high-quality steel alloy black oxide treated inserts. Works in most cases when previous repairs have failed.

Question: Will the 389XL work when the Time Sert 5600 has failed?

Answer: No, the O.D. of the 389XL insert is only slightly larger than the 5600's largest insert. The O.D. of the 389XL's insert is 19.90mm and the O.D. of the 5600's largest insert is .19.80mm.

Question: Will the 389XL work when a Calvan 38900 kit has failed?

Answer: In most cases, the 389XL will work when a 38900 insert has failed, leaving the hole larger than normal. Although the reamer may not remove much material in this situation, it can still help prepare the hole for threading. The 389XL features the largest outer diameter possible, optimized for the material limitations of the cylinder heads used in Ford 4.6, 5.4, and 6.8 SOHC engines.