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Calvan 389-100 Single Spark Plug Insert for 38900 Kit 4.6, 5.4, 6.8L

(16 reviews) Write a Review
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0.10 LBS
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Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 or above and get $3.00 off
  • Black Oxide Treated 389-100 insert
  • Outside measurement on outside of threads
  • Outer diameter of lip of inserts which can also help seal
Frequently bought together:



Latest design with black oxide rust preventive treatment, cheap copies online are not black! The 389-100 is a single 5.4L replacement sparkplug insert for the Calvan, Horizon Tools M14x1.25 Taper seat 38900 spark plug thread kit. Also works for the equivalent Blue Point FRT10 model sold by Snap On and SP389FC sold by Mac Tools. We've sold the Calvan kit's and inserts to repair Ford spark plug blowouts for years with great feedback! These Cal-Van inserts will last the lifetime of the engine. Of course since you've found this product listing you may already know how great the repair is! We ship the same day if the order is placed before 3PM. Normal ship time is 2-3 days. Need it quicker? Call 800-734-8665.

  • Over-size insert (Only one size is made for this kit). It measures .73" on the outside diameter O.D.
  • Steel Alloy is ten times stronger than aluminum.
  • Buy in bulk and save - see the bulk pricing options.
  • See the YouTube video for more information on Cal Van inserts.
  • Snap On FRT10-INS About 1/2 of the cost compared to the Snap On Tool Truck!

Is your Snap On, Mac or Matco guy out of inserts? Or just looking for a better price? Congratulations it's your lucky day. The 389-100 is equivalent to the Snap On/Blue Point FRT10-INS replacement insert. Snap On sells them for over $35 each. This is also the same spark plug insert for Mac Tools part number SP389FC thread repair kits. Same as Matco FTS389 inserts as well (same manufacturer). Same as CAL389-100, 389-100 ET389-100, ET 389-100, CV389-100, CV 389-100. Also sold as CTA Tools 2367, Mountain 9200, ATD 5400. 


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Warranty Information

Limited Lifetime
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16 Reviews

  • 5
    Ford F150 5.4 and 4.6


  • 5
    The Right Insert

    Excellent product, very well made and just the thing to repair a blown spark plug hole. You need the kit to install them but it ends up better and stronger than the factory head.

  • 5
    I love this kit!!

    These inserts work with the calvan 38900 kit... I have used it four separate times since I purchased it and will never go about it any other way again!!!

  • 5
    Spark Plug Insert for Ford

    2002 Ford F150, 4.6l with 285k miles, Cylinder #3 Watched several YouTube videos. Used locktite on threads and JB Weld on lip of insert as suggested by Ron Williams. Waited 24 hours and fired it up with no issues. Took it for a 200 mile trip a few days later. Feels solid.

  • 5
    Very Dependable

    I have put at least 100 if not more of this in and never had one to fail or blow out.

  • 5
    More threads for spark plug

    If you watch the repair videos carefully using JB weld under "lip" of insert and proper locktite for threads. Insert provides multiple threads for spark plug unlike the original 4 threads in the factory cylinder head. Take your time. Am now a couple days for JB weld and loctite to set.

  • 5
    Great product, saved me time and money

    Used on a 2001 Ford F250.

  • 5
    Money Saver

    This product makes the job more easy and also a money saver for our customers.

  • 5
    Sparkplug inserts for Fords

    Excellent product. Even better is the great customer service and immediate shipment.

  • 5
    Spark plug inserts

    Have used many. These are as good as any and priced right. Skip

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