Top 10 Block Sealer Head Gasket For Cars – Engine Cleaners & Degreasers

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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 - Seals cracked cylinder heads and blocks. Fixes leaking freeze and core plugs. Stops heater core and radiator leaks. Repairs blown head and intake gasket leaks.
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. K&W

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

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K&W #ad - Works with all antifreeze or plain water. Seals larger holes with less fluid loss than competitive products as proven by lab test ASTM D6107. Contains 3 unique technologies. Cool-x conditioner – lowers operating temperature as it circulates through cooling system. ". Easy pour and go formula! Permanently fixes head gaskets, cooling systems, engine blocks, and cylinder heads. Nanotechnology permanently fixes the smallest cracks and crevices. Military-strength fibers create multi-layer repair over cracks with a web-like weave.
BrandK&W #ad
ManufacturerCRC #ad
Height9.54 Inches
Length3.4 Inches
Width3.4 Inches
Part Number401224-6
Model401224-6
Warranty2 year manufacturer

3. KALIMEX LTD

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K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair

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KALIMEX LTD #ad - Scientifically tested - k-seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147.

A permanent repair, guaranteed for the lifetime of the engine. Just pour & go – no need for expensive head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak. Fixes blown head gaskets, cracked heads and blocks. If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully.
BrandKALIMEX LTD #ad
ManufacturerSolv-TecA #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberKSLST3501
ModelKSLST3501
WarrantyLifetime warranty does not cover abuse

4. Bar's Leaks

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

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Bar's Leaks #ad - Seals cracked cylinder heads and blocks. Stops block leaks. 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. Repairs blown head gaskets.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.5 Inches
Length9.5 Inches
Weight1.5 Pounds
Width2.6 Inches
Part Number1111
Model1111
Warranty1 year manufacturer

5. CRC

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16 Oz, CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal

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CRC #ad - Withstands extreme pressure and temperatures of a cooling system and will not wash away. Permanent molecular seal that’s as strong as steel. Seals cracks & holes in cast iron and aluminum engine blocks, and copper, head gaskets, freeze plugs, aluminum and bi-material radiators & heater cores. For use in all water-cooled diesel and gasoline vehicles. Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems.
BrandCRC #ad
ManufacturerCRC #ad
Height2.13 Inches
Length5.87 Inches
Weight1.15 Pounds
Width2.31 Inches
Part Number401016
Model401016
WarrantyManufacturer Warranty

6. Blue Magic

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11.4 oz., Blue Magic 1008-24PK Liquid Glass Metallic Seal-Up

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Blue Magic #ad - For use in systems up to 6 gallons. Seal withstands up to 2000 degrees Fahrenheit. Seals cracks permanently. Permanent cooling system sealer; Liquid glass and copper formula. Engine blocks, radiators, heater Cores, Heaters, Freeze Plugs.
BrandBlue Magic #ad
ManufacturerBlack Magic #ad
Height5.79 Inches
Length2.28 Inches
Weight0.71 Pounds
Width2.28 Inches
Part Number1008
Model1008
WarrantyLIMITED WARRANTY

7. BlueDevil Products

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BlueDevil Head Gasket Sealer 38386

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BlueDevil Products #ad - Contains no solid or particulate matter that can harm a vehicles engine. Permanent Repair. Good for head gaskets, Warped or Cracked Heads, heater Cores, and Freeze Plugs. Safe and easy to use. Alternative solution for costly and time consuming repairs.
BrandBlueDevil Products #ad
ManufacturerBlueDevil Products #ad
Weight2.87 Pounds
Part Number38386
Model38386

8. Bar's Leaks

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18 oz., Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak

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Bar's Leaks #ad - Repairs blocks. Repairs blown head gaskets. Repairs heater core leaks. Seals larger leaks seals. Repairs freeze plug leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.6 Inches
Length7.5 Inches
Weight1.3 Pounds
Width2.6 Inches
Part Number1109
Model1109

9. Bar's Leaks

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

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Bar's Leaks #ad - Seals cracked cylinder heads and blocks. Repairs blown head gaskets. 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. Stops block leaks. Included components: Unit, Instruction Guide. 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.
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

10. K&W

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K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology, 32 Fl Oz

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K&W #ad - Package width: 8. 610 cm. Package length: 4. 394 cm. Package height: 24. 206 cm. Product type: auto aCCESSORY.
BrandK&W #ad
ManufacturerCRC #ad
Height9 Inches
Length2.5 Inches
Weight1.67 Pounds
Width4 Inches
Part Number401232
Model401232
Warranty2 YEAR MANUFACTURER WARRANTY