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TIME-SERT J-42385-500BS BIG SERT Northstar Head Bolt Thread Repair M11x1.5

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  • J-42385-500BS Wise 1
  • J-42385-500BS Wise 2
  • J-42385-500BS Wise 3, laminated instruction card.
  • J-42385-500BS Wise 4, showing size of tooling.
  • J-42385-500BS Wise 5, inserts and loctite.
  • J-42385-500BS Wise 6 Case for Northstar over size kit.
  • J-42385-500BS Wise 7 - entire thread repair kit Big Sert
  • J-42385-500BS Wise 8 (Step Drill).
  • J-42385-500BS Wise QTY 10 (BIG SERT insert).


Includes Free ShippingThe TIME-SERT Big Sert (Oversized) J-42385-500BS head bolt thread kit for 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 GM Cadillac Northstar engines with the very common size M11x1.5mm (11 millimeter by 1.5 millimeter) head bolt size.

DennisB The tooling for the J-42385-500BS has adjustable depths so the different depths of holes can be serviced. This allows the J-42385-500BS head bolt thread repair kit to be used on a wide range of Northstar engines. It's important to be cautious NOT to over drill the depths in the engine block. See the video linked above for more information on how to use the thread repair kit.

*Note The J-42385-500BS is for an "oversize" repair which means a previous repair insert, like a failed Helicoil or another type, had been used before. The 'BS" at the end of the tool number stands for Big Sert. Big Sert is the manufacturer's designation for over-size. Just the outside diameter is larger so the Big Serts accept the original size head bolts. 

Steel bushing type inserts (part number J-42385-507BS) are used which are ten times stronger than steel. The kit comes with a quantity of 10. The block takes a total of 20 inserts so it's important to purchase 10 more inserts to have enough to repair the whole block. Since the outer diameter is larger the alignment dowels for the head need to be larger as well. The kit comes with two alignment dowels. If fixing all holes in the entire block (all twenty) two more alignment dowels will be needed part number J-42385-508BS.

The original TTY (Torque to Yield) head bolts are used which allow proper clamping just like the engineers at GM had in mind. That's why GM does NOT recommend aftermarket studs that have cropped up on the market recently. TIME-SERT standard size is the ONLY recommended repair for the Northstar. BIG SERT is the alternative to discarding a block when a regular size insert like a Helicoil has failed.

Time Sert J-42385-500BS Head Bolt Thread Repair Kit Includes: 

Qty   Tool     Item Number

1    Fixture Plate  56111

1    Drill Bushing  J-42385-302BS

1    Alignment Pin J-42385-303BS

2    Bolts, Short  J-42385·503

2    Bolts, Long  J-42385-604

1    Step Drill  J-42385-2006BS

1    Tap  J-42385-2007BS

1    Insert Driver  J-42385-2008

1    Stop Collar J-42385-2017BS

1    Loctite  6020

2    Dowel J-42385-508BS (used on corner holes 4 total needed for entire block)

1    Driver Oil  J-42385- 110

10  Big Sert Inserts J-42385-507BS (20 total needed for entire block, 10 per side)

1    Laminated Instruction card.

pdficon-small.png See the Time-Sert J-42385-500BS Big Sert Thread Repair Kit Instructions pdf - Also see the YouTube video linked above for more tips for a proper repair.

*Note TTY head bolts should be replaced as per auto repair manual. Reusing old head bolts can cause repeat thread and/or head gasket failure.

Cadillac Northstar Engines - A total of 20 inserts are needed for the Northstar engines if repairing entire block.

  • 95, 96, 97, 98, 99, 00, 01, 02, 03 
  • Cadillac Deville 4.6 L 281 CID V8 DOHC 32 Valve Northstar 1995-2003.
  • Cadillac Eldorado 4.6 L 281 CID V8 DOHC 32 Valve Northstar 1995-2003.
  • Cadillac Seville 4.6L 281 CID V-8 DOHC Northstar 1995-2003.
  • Oldsmobile Aurora 4.0 Liter 243.8 CID V8 Double Over Head Cam 95-99
  • TIME-SERT is Tested and approved by GM. 

Mouse over the images above for a more detailed view of the kit components. Also notice our bulk discount prices on TIME-SERT replacement inserts for thread repair kits. Need more information on TIME-SERT thread repair kits? Visit our auto repair blog section on thread repair kits for tips, advice and all your thread repair questions answered. Just comment and we will be quick to respond.

See the pdficon-small.png TIME-SERT products pdf for more information on thread repair kits and inserts. Some are listed for certain applications on cars, trucks and motorcycles. The pdf is a partial application list so feel free to email or call if we can assist with your particular need. We also accept inquiries regarding our daily TIME-SERT specials. Remember TIME-SERT is recommended by leading car manufacturers like the General Motors Corporation. In fact TIME-SERT is GM's only authorized repair for head bolt threads.

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