Top 10 Head Gasket Stop Leak – Automotive Replacement Head Gasket Sets

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1. Bar's Leaks

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Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

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Bar's Leaks #ad - Repairs blown head and intake gasket leaks. Stops heater core and radiator leaks. Fixes leaking freeze and core plugs. Seals cracked cylinder heads and blocks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height3.22 Inches
Length9.78 Inches
Weight2.65 Pounds
Width3.22 Inches
Part NumberHG-1
ModelHG-1
WarrantyManufacturer Warranty

2. BlueDevil Products

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BlueDevil Head Gasket Sealer 38386

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BlueDevil Products #ad - Safe and easy to use. Contains no solid or particulate matter that can harm a vehicles engine . Alternative solution for costly and time consuming repairs . Permanent Repair.
BrandBlueDevil Products #ad
ManufacturerBlueDevil Products #ad
Weight2 Pounds
Part Number38386
Model38386
WarrantyLIMITED WARRANTY

3. K-Seal

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K-SEAL Ultimate Permanent Head Gasket Repair ST3501 16oz Multi-Purpose Formula Stop Leaks in the Head Gasket, Cracked/Porous Blocks, Trade Trusted Stop Leak, Radiator & Heater Core. A True Pour & Go

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K-Seal #ad - Repairs in minutes: permanently fix blown head gaskets, cracked heads and cracked/porous blocks including aluminum heads in old and new cars. Save time/money. The only head gasket and block sealant that is 3rd party tested to meet ASTM D3147. Over 8 million bottles sold.

Seals cracks and stops leaks: a diy alternative to costly repairs, our head gasket fix permanently seals cracks and holes! Quickly repair your blocks, leaking radiator, freeze plug, heater core and water pump casing with no adverse impact on efficiency. Check the technical Specification section of this page for extra instructions for a successful repair. Customer support: if our head gasket repair leak doesn’t seal your intake gasket, the system might be over-pressurized. Pour and go: our head gasket sealer is easy to use just shake, absolutely no draining, it mixes with all types of antifreeze, add to your radiator/overflow and run the engine! Unlike some competitive products, flushing or pulling the thermostat required.

Us bestseller. Scientifically tested: safe, effective, the repair withstands the high pressure of the combustion chamber, our head gasket and block repair seals leaks up to 1/32 of an inch! Once cured, all without failing or clogging the cooling system.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberST3501ND
ModelKSLST3501
WarrantyLifetime warranty does not cover abuse

4. STEEL SEAL

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Steel Seal Blown Head Gasket Fix Repair Sealer, 8 Cylinder

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STEEL SEAL #ad - Used by thousands of repair shops nationwide. Used for 8 Cylinder Engines. Permanently seals a crack in the head gasket. Do-it-yourself Pour in Head Gasket Fix. Backed with a 100% Money-Back Guarantee.
BrandSTEEL SEAL #ad
ManufacturerSteel Seal #ad
Part Number8CYL001

5. Bar's Leaks

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Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.

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Bar's Leaks #ad - Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks. Seals cracked cylinder heads and blocks. Stops block leaks. Repairs blown head gaskets.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.5 Inches
Length9.5 Inches
Weight0 Pounds
Width2.6 Inches
Part Number1111
Model1111
Warranty1 year manufacturer

6. K-Seal

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Pour and Go, Block, Head Gasket, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, K-SEAL Coolant Leak Repair, Water Pump Casing, and Freeze Plug, Trade Trusted-Stop Leak, Heater Core

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K-Seal #ad - Save time/money. Us bestseller. Over 8 million bottles sold. Repairs in minutes: formulated to permanently weld radiators, including hard plastic aluminum heads and blocks in old and new cars. Pour and go: our cooling system sealer is easy to use: just shake the bottle, add to your radiator/overflow and run the engine! Unlike some traditional products, it mixes with all types of antifreeze, absolutely no draining or flushing required.

Scientifically tested: safe and effective, the repair withstands the high pressure of the combustion chamber, our cracked block repair can seal leaks up to 1/32 of an inch! Once cured, all without failing or clogging the cooling system. Customer support: if our engine coolant leak doesn’t seal your head gasket, the system might be over-pressurized.

Seals cracks and stops leaks: a diy alternative to costly repairs, freeze plug, our coolant leak fix permanently seals cracks and holes! It quickly repairs your leaking radiator, heater core and water pump casing with no adverse impact on efficiency. The only car radiator and gasket sealant university tested to meet ASTM D3147. Check the technical Specification section of this page for extra instructions for a successful repair.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
ModelST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

7. Bar's Leaks

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20 oz., Bar's Leaks 1100 Head Gasket Repair

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Bar's Leaks #ad - Repairs blown head gaskets. Stops block leaks. Seals cracked cylinder heads and blocks. Head gasket sealant is not compatible with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and removed. Dual action 2 part formula — liquid ceramic: liquid penetrates large and small leaks to form a seal actually harder than the original head gasket — REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height8.3 Inches
Length1.8 Inches
Weight1.41 Pounds
Width3.4 Inches
Part Number1100
Model1100
Warranty1 year manufacturer

8. Genuine GM

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4 Grams, Pack of 5, Genuine GM 12378255 Fluid 3634621 Cooling System Seal Tablet

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Genuine GM #ad - Non-toxic. For use with all vehicles. Dex-cool compatible. Formulated for automotive use. Engine application is based on liters of volume in cooling system.
BrandGenuine GM #ad
ManufacturerGM #ad
Part Number12378255
Model12378255

9. K&W

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32 Fl Oz, K&W 401224-6 FiberLock Head Gasket & Block Repair

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K&W #ad - Contains 3 unique technologies. Military-strength fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-x conditioner – lowers operating temperature as it circulates through cooling system. ". Seals larger holes with less fluid loss than competitive products as proven by lab test ASTM D6107. Easy pour and go formula! Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads. Works with all antifreeze or plain water.
BrandK&W #ad
ManufacturerCRC #ad
Height9.54 Inches
Length3.4 Inches
Weight2.5 Pounds
Width3.4 Inches
Part Number401224-6
Model401224-6

10. ATP Automotive

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8 Ounce Bottle, ATP AT-205 Re-Seal Stops Leaks

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ATP Automotive #ad - Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems. Does not contain petroleum distillates, will not over-swell or breakdown seals. Compatible with conventional and synthetic oils, gear oil, ATF, power steering fluids and hydraulic oil.8oz bottle will treat a 6 quart capacity, adjust accordingly. Professional strength fast acting resealer, stops leaks fast.
BrandATP Automotive #ad
ManufacturerATP #ad
Height4 Inches
Length7 Inches
Weight0.11 Pounds
Width4.5 Inches
Part NumberAT-205
ModelAT-205
WarrantyMoney Back Guarantee