Blown Head Gasket Repair (HG-1)

Blown Head Gasket Repair


  29 Reviews

Bar’s Leaks Professional Head Seal Carbon Fiber Blown Head Gasket Repair is the strongest antifreeze-compatible solution on the market, period. It penetrates a leaking, damaged or blown head gasket, drying to form a seal that’s actually stronger than the original head gasket itself.

DIRECTIONS (Note: Protect from freezing.)

  1. Install only in a cold engine. Shake bottle well. Remove radiator cap and pour the correct amount of product in per the dosage chart. Fill radiator and reservoir / overflow tank to proper level and reinstall radiator cap. TIP: Radiator cap may be on top of radiator, on engine, mounted on a hose, or a screw cap on the pressurized reservoir overflow tank.
  2. Turn heater on hot and fan on high. Run engine until thermostat opens or normal operating temperature is reached. Turn vehicle off and allow engine to cool. This may take up to 30 minutes or longer.
  3. Top off radiator (add coolant as needed) and either run engine at high idle (approximately 1200 RPM’s for vehicles with a tachometer) or gently drive for 15 minutes. Turn vehicle off and allow engine to cool.
  4. Top off radiator and leave Bar’s Leaks Head Seal Blown Head Gasket Repair in system for continued protection. Drive vehicle as normal. Most leaks seal instantly, but some can take additional thermocycles which happen over a few days of usage.

Buy Online:

Walmart Logo

Available at:


  • Professional-grade, easy-to-use head gasket solution
  • Strongest antifreeze-compatible solution on the market

A PTEN Top 100 Award-winning Product for 2016

When you think about a blown head gasket, do you see your money being spent at the repair shop? How much time and inconvenience is involved in taking your car to a mechanic for blown head gasket repair? The lost time is a frustration, and the money it takes to alleviate a head gasket leak is overwhelming. That’s because fixing a head gasket can cost you quite a bit (typically $1,500-$3,000). We know you would rather spend that money on the things that matter most. That’s why we created this professional-grade, easy-to-use head gasket solution. It’ll repair your leaking head gasket and save you money.

Bar’s Leaks Professional Carbon Fiber Blown Head Gasket Repair is the strongest antifreeze-compatible solution on the market, period. It penetrates a leaking, damaged or blown head gasket, drying to form a seal that’s actually stronger than the original head gasket itself. It’s the best formula to stop all other coolant leaks in plastic, cast iron, copper and aluminum radiators, heater cores, freeze plugs, gaskets, intake manifolds, cylinder heads and engine blocks. The special formulation also contains Xtreme Cool™, which stops overheating and reduces water temperature. Our fast, effective head gasket sealer is the result of decades of research and testing by top-flight chemical engineers. When you choose Bar’s Leaks for blown head gasket repair, you’ve got a product that’s designed to fit perfectly into the lifestyle and budget of everyday drivers.

A physical blown head gasket repair can be expensive, which is why Bar’s Leaks is proud to offer an affordable solution for your head gasket leak. And best of all, you don’t need any automotive expertise to install our head gasket sealer. If you know how to open the hood of your car, you can use this blown head gasket repair product.

Bar’s Leaks Professional Series – the products used by techs nationwide. Go grab yourself a bottle so you can spend your money on the things that matter. It’s time to get your show back on the road. Don’t let a blown head gasket sideline your life – or your wallet.


Customer Reviews

  29 Reviews
Submit your review

Create your own review

Average rating:  
 29 reviews
by Ellen on
MINI Cooper lives on!

My hobby car 2011 MINI Cooper was mis-firing one #1 cylinder, small leak in the head gasket, I was looking at a huge repair bill. So I tried Bars head gasket repair, and so far so good! The coolant level stays up, no check engine light is on, no misfires, and the engine fan doesn't come on at all. 141,000 miles and hoping it last until I decide to keep or fix😊 Thank you Bars leak!

by Gary R on
Great Product highly recommended

2002 Olds Bravada with 269,000 miles. Had a water pump lock up and then a bad radiator. I replaced the water pump radiator and new thermostat with radiator cap. Started to overheat in just a  few miles if I let pressure build up in the cooling system it started bubbling in the reservoir with lots of white smoke and coolant loss. Never had water in oil gasket leak on exhaust side into coolant system. Was ready to start the tear down to install the head gasket. O’Reilly had the best Bar's Leaks HG1 on sale for $35 so I thought what do have to lose? I followed the directions and even though still white smoke at 1st it was not overheating. After letting cool down and did the last step what amazing difference! No white smoke temp is perfect performance is up and actually runs better than it has for very long time. Driven it now about 200 miles and my SUV running strong! Highly recommend this product because it is a “miracle in bottle” Thanks Bar's Leaks!

by Gary L. on
Bar's leak worked great

My '94 Chevy Silverado with 201,000 miles with the 5.7 engine had started to slowly lose coolant. No leaks from the radiator. I finally saw that a tiny puddle of coolant would collect in a space where the intake manifold met the cylinder head. I put about 3/4 of the large bottle of Bar's Leaks HG-1 into the radiator and after a running it thru just 2 thermo-cycles: no more leak! Radiator level stays perfect. I def recommend giving it a try.

by Javier Osorio on
Bar's Leaks Head Seal

2003 Silverado 1500 4.3 . I used this product for my water intake gasket leak. I was adding about half a gallon a week. This product works great, I had my doubts about this product because I didn't get results right away, but after a month of having it in my system, it did the job.

by Jack on
Blown Head gasket

I've been having issues with my car over heating and misfiring , I replaced the serpentine belt , spark plugs and all 6 coils and still my car was misfiring and over heating .
I finally took it to a shop and they gave me the bad news, Blown Head Gasket :( I wanted to cry , The mechanic said I should just junk the car as it would cost more to fix the head gasket than the car was actually worth. On a whim I searched for a cheaper fix and came across Bar's Leaks and thought what the heck . The mechanic told me to not bother with it because it wouldn't work but I had already bought it so there was no going back in my book. I used the Bar's Leaks Head Gasket Repair, carefully following the instructions and to my complete surprise it worked!!!
I drove the car and it hasn't over heated and the misfire in cylinder 4 stopped, no more white smoke from the muffler and I'm just in shock! Had I not given Bar's Leaks a try and listened to the mechanic my car would be junked and I'd be looking for a new car. Instead my car runs like new and better than ever thank you so much, from the bottom of my heart thank you, you saved me so much money.

by Johnny Miller on
94 Geo Metro

I have a 94 Geo Metro that I use as a commuter car. 50 miles a day round trip commute.  About 6 months ago I noticed that the coolant reservoir was periodically empty. Water pump was changed about 5 years ago. Thermostat about a year ago. The radiator cap wasn’t in great condition so I replaced it and thought that was the problem. After that every once in a while I noticed the reservoir empty again. Car never got hot, but the empty reservoir became more and more frequent. Then one day I pull into work and coolant is running out from under the car. I open the hood and steam is blowing out of the coolant reservoir overflow. Now I was concerned. By then I had started to carry a jug of coolant. Topped off the car and drove it home. Next morning I remove the radiator cap and ran the car. Once the car warmed up and was revved, here comes the foam. I knew it was a head gasket leak.

By now I already had my suspicions and had done some research on quick fix solutions. Everything else was at least twice as much and required way too much effort. One product only worked with traditional coolant. Another required a bunch of flushes and thermal cycles. The Metro has a really small cooling system and after reading I was really careful to pre-mix (shake well) the stop leak with coolant at a rate of 8 ounces per gallon.

Bottom line is that it did work.

by Paul craig on
Blown head gasket

Had a blown radiator hose then overheated real bad blowing the head gasket. Around $2,500 to fix the problem.  I found Bar's Leaks online and followed directions. Product works real good.

by Reverend James Bolin on

Our 1992 Bluebird bus with its 6 cylinder diesel developed a head gasket leak. After installing Bar'’s Leaks Head Seal Blown Head Gasket Repair, the leak stopped. All the shop crew from Teen Challenge International of Mid America thanks Bar'’s Leaks for making a fine product. When you say professional grade, you aren't kidding.

by Steven L. - Nevada on

OK, I never write reviews but feel compelled to do so here. My '02 Ram 1500 is my pride joy but a head gasket leak has it burning coolant, blowing white exhaust and getting worse by the day. After two mechanics estimated a $2,000 to $4,000 repair bill I had nothing to lose by spending $45 on your Blown Head Gasket Repair. I used the full bottle due to the large capacity and followed directions. In the miles I have driven since, I would have added nearly a gallon of coolant mix. I have not needed to add a drop. Tight as a drum so far. I was skeptical but this is simply amazing. Shame on the shops for not telling me to try this first. Thanks!

by S. P. - Waco, TX on

I want to start this communiqué with the following: THANK YOU, THANK YOU, and THANK YOU!!!!! I recently purchased a 1993 Toyota Camry with a bad motor. I replaced the bad motor with a salvage yard engine. Not long after the engine swap, I blew a two inch crack in a month old radiator and overheated the replacement motor. After replacing the radiator, I had zero trouble with overheating during in-town driving, but was overheating after 50 - 60 miles of highway driving. Without fail, I would stop to find the coolant boiling out to the overflow tube of the coolant tank. I replaced the radiator caps, thermostat, the water pump, and the fan assembly to no avail. I also used a cooling system flush product to ensure no rust deposits in the engine, I even had the shop that did the engine swap pressure test the cooling system.

After replacing a faulty cap, the system was holding pressure. The engine continued to overheat on the highway! I was ready to rip my hair out! I researched the problem online and concluded that I must have a warped head or other small crack. I researched a couple of products online that both required determining which cylinder was the problem and using their product to fix the issue. The biggest drawback was having to flush the system, disconnect the spark plug and fuel injector for the affected cylinder, then run the product through the cooling system. After cooling down, you had to flush the product out to the engine and allow the cooling system to stay open to the air to allow the product to "cure" for 24 hours. Only then could you add antifreeze and water and drive the car.

I am a fair backyard mechanic but it just sounded like a little more work than I really wanted to do. Not to mention being without transportation for a whole day. I decided to stop into a local chain parts store and check out their products. I have worked in the retail parts industry and was familiar with a block seal product called Blue Devil. I had heard good things about it but still had the dilemma of having to flush the system twice to use the product. Well, sitting on the shelf right next to the Blue Devil product was Bar's Leaks HEAD GASKET & COOLING SEALANT with carbon fiber technology. What appealed to me was not having to flush the cooling system twice to use the product, just add to existing coolant and follow some very simple instructions. Well, I bought the product and the Bar's Leaks worked like a charm. I have made three separate road trips running 75 MPH with the A/C blasting and had zero boil over or overheating of any kind! This carbon fiber block seal saved my bacon and my car! This is the best $60.00 I have spent in a long time and just reinforces my faith in the Bar's Leak name! Besides, with the capacity of my cooling system, I am able to get two treatments out of one bottle! This is awesome value for your automotive dollar! During this whole mess, I spent $75.00 on antifreeze alone! My sincerest thanks to the Bar's Product team, you have done an outstanding job for this customer and have ensured my loyalty in the years to come. Keep up the great work! I am a veteran and a proud American. I like buying products from the USA and will continue my patronage. I have already told several people how this worked for me and will continue to spread the good word! God bless and take care.

Page 1 of 3:

FAQ (click or touch to expand)

Product Videos

SDS/Technical Info

Product Data SheetOpen

Email that matters

don't miss our sale notices, product tips, and videos from bobby j.

We won’t spam you or sell your email to anyone, ever. Promise.