Copper head gasket vs mls. They include: · Ford passenger car 4.

Copper head gasket vs mls 030 bore. Sep 7, 2007 · When normal head gaskets can't do the job on full-race, conventional American V-8s, engines builders usually resort to O-ring wire and copper gaskets. Shop Now at the Guaranteed Lowest Price! $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: 2025 Mar 15, 2012 · Good question. Show More. Features: Made from spring stainless steel for strong corrosion resistance; Each MLS head gasket is coated with a . See full list on dsportmag. JEGS Copper Exhaust Gaskets. While most MLS gaskets require a surface smoother than 40 Ra (240 Rz), these Fel-Pro® PermaTorque MLS head gaskets will seal a surface finish as rough as 60 Ra (360 Rz). Fel-Pro 17040 PermaTorque ® MLS with NextGen Coating Fel-Pro PermaTorque MLS head gasket with next generation coating helps to accommodate for today's higher temperature engine environment. Using a gasket maker to replace a head gasket. 1. The gaskets also have excellent rebound characteristics and resist corrosive substances. Dec 23, 2024 · MLS Cylinder Head Gaskets have excellent rebound qualities, resist corrosive substances, and reduce bore distortion. Shop Now at the Guaranteed Lowest Price! $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: 2025 Installing gaskets in the correct direction is critical. Proprietary NextGen Coating Technology - Precise amount of coating is applied to withstand higher engine temperatures and accommodate surface Dec 19, 2024 · The outer layers are Viton-coated stainless steel to create a superior seal not available with other steel or copper gaskets. Each layer is individually formed using a state of the art laser cutting process and embossing The importance of attaining the appropriate surface finish, one that matches the style of head gasket being used, cannot be overstated. Gasket, FelPro, Hedman Headers, and others. PermaTorque® The most reliable no-retorque designs available on the market today, PermaTorque® head gaskets are significantly better at DURABLE, BLOWOUT-RESISTANT SEAL. The new ICS Titan racing head gasket from SCE has patented combustion seals with built-in o-rings to seal turbocharged, nitrous boosted, or high MLS Cylinder Head Gaskets reduce bore distortion, resist corrosive substances, and have excellent rebound qualities. Features: Made from Stainless Spring Steel to offer an extremely strong corrosion resistant head gasket; Each MLS head gasket is coated with a . The only drawback with MLS gaskets are their price. Paul Svinicki from Paul's High Performance has a lot of experience with supercharg The copper head gaskets also Fel-Pro PermaTorque ® MLS with LaserWeld ™ Technology. Enter in your car's information including vehicle type, year, make and model. 060¨ H2138SP1027S Head Gaskets Cometic MLS head gasket . SCE Gaskets Inc. They include: · Ford passenger car 4. Block Seal Coolant Leak Fix Stop Leak (1109) Cooling System Repair (1150) Liquid Aluminum (1186) Radiator Stop Leak Tablets (1177) Rhizex Radiator Stop Leak (1199) Engine. MLS Gaskets and the Aftermarket Environment Select PermaTorque MLS gaskets feature a special coating formulated specifically for the aftermarket repair environment. Boosted cars running higher pressures can benefit from the SCE Gasket line. A proper header gasket is crucial for maintaining optimal exhaust flow and maximizing engine power. If a PermaTorque MLS head gasket does not feature LaserWeld, it simply means the emboss beads provide a reliable seal for that specific application. 001" thick Viton rubber that is bonded to the outer stainless steel layers Nov 5, 2019 · Created to help seal imperfect surfaces, Fel-Pro PermaTorque MLS head gaskets are equipped with a proprietary NextGen coating that resists scrubbing and compensates for surface finishes as rough Fel-Pro Copper Wire Ring Head Gasket Ford 260/289/302/351W. Part Number: 375-1144-061. Most can be found in many different thicknesses to alter the compression ratio a May 5, 2010 · Copper head gaskets receive the same torque sequence and final torque settings as composite or MLS gaskets. Until recently steel head gaskets consisted of four to six layers […] When the OE composite designed cylinder head gasket changed to an improved Multi-Layered Steel (MLS) design for the 4. MLS gaskets with stoppers have traditionally been constructed of either a thin folded layer (0. Single head gaskets are also available for this engine, part numbers 4068, 4068A, and 4068B. A SPECIAL HIGH TEMPERATURE COATING USED ON THE OUTER LAYERS OF THE GASKET IS SUFFIECIENT TO PROPERLY SEAL GASKET. 4 to 8. Fel-Pro’s PermaTorque® MLS head gaskets use a specialized coating that accommodates finishes as rough as 60 R a. Both have a place in the market, but which is right for you? Mar 11, 2022 · Depending on your unique engine setup and what you plan to use in terms of boost, cubic inches, cooling, tuning, and horsepower all factor into whether MLS or copper gaskets are a better choice. MAHLE Clevite currently offers the Victor Reinz Wave-Stopper - MLS head gaskets for a range of Ford engines. The aluminum gaskets rely on an internal graphite seal to prevent leakage. The outer layers are Viton-coated stainless steel to create a superior seal not available with other steel or copper gaskets. Fel-Pro® Performance wire ring head gaskets feature a 321 Series stainless steel armor surrounding each cylinder, in addition to a pre-flattened steel or copper wire ring that provides highly-concentrated sealing around the combustion chamber. $112. MLS Header Gaskets Mar 22, 2023 · Get the Best Performance with Chevrolet Performance Cylinder Head Gasket LSA/LS9 or Supercharged LS3/L92 6. 12 AUD Qty In Stock = 4 Feb 14, 2020 · 1. We have three main products to address head gasket issues: our Bar’s Leaks Head Gasket Repair (p/n 1100), Bar’s Leaks Head Gasket Fix (p/n 1111) and Bar’s Leaks Professional Carbon Fiber Block Seal Head Gasket & Cooling Sealant (p/n HG-1). 6L (2V) SOHC 1991 - 2006 Fel-Pro PermaTorque MLS head gaskets and PermaTorque MLS with NextGen Coating head gaskets both use LaserWeld when additional sealing stress is needed. The multi-layer construction of MLS head gaskets requires expensive precision tooling, and 3 to 5 The source of a blown head gasket or cracked head is usually from overheating. 99 Mr. Our new PermaTorque MLS head gasket with next generation coating helps to accommodate for today's higher temperature engine environment. JEGS offers the best head gaskets for cars and trucks from top vendors like Cometic Gaskets, Fel-Pro, SCE Gaskets, Mr Gasket, JEGS, and others. JEGS offers a wide selection of the best header gaskets and header collector gaskets for Chevy/GM, Ford, Mopar, and more from brands like Mr. While experimental methods for determining necessary gasket tightening loads and experimental data r Jan 6, 2025 · Viton-coated stainless steel outer layers create a superior seal not available with other steel or copper gaskets. 027" thick 4. 100˝ Bore Premium engine sealing set. com Sep 17, 2008 · MLS head gasket is the best for high performance applications. They are made to hold the pressure of high boost engines. Gasket Multi-Layered Steel (MLS) Exhaust and Header Collector Gaskets are designed for extreme cylinder pressures produced by high horsepower-high compression engines. In this article, Fel-Pro® will help you determine ‘which side is up’ to correctly install various gaskets types. For cylinder heads, stick to the OE-style gasket. For example, SCE offers eight different thicknesses between 0. 001" thick Viton rubber that is bonded to the outer stainless steel layers Lingenfelter offers these 0. Made from stainless spring steel for exceptional corrosion resistance Aug 19, 2011 · Horse Sense:Ford SVT uses Cometic MLS gaskets on the '03-'04 Mustang Cobras. LS1/LS6 2817** 4. The gaskets have excellent rebound characteristics and are made to resist corrosive substances. Made from Stainless Spring Steel to offer an extremely strong corrosion-resistant cylinder head gasket; Each MLS head gasket is coated with a . SCE Copper Gaskets made to withstand 7,000 horsepower drag cars. maintains torque set and creates a strong seal around exhaust ports with resistance to flange motion. Mr. These innovative head gaskets provide the correct design for MLS-equipped vehicles and feature a proprietary coating that accommodates surface finishes up to 80 Ra and helps achieve a leakproof seal. Jan 7, 2025 · The gaskets withstand shearing forces from bimetal (aluminum/iron) head and cast iron block combinations. Fel-Pro head gaskets are also designed so that no additional sealers are needed. Browse our full line of high performance head gaskets and head gaskets kits that will help complete your next race or street engine build. , Nov. Fel-Pro, ASE Certified Master Technician, John Gurnig provides examples why most Fel-Pro gaskets do not require the use of sealant. 3L in 2001 and 6. The source of the overheating can be a low coolant level due to hose failure, water pump failure or other gasket failure. Each MLS head gasket is coated with a . Technical Resources. 2L engines 12622033 parts at JEGS. GASKET MLS HEAD GASKETS. Apr 10, 2016 · For high-performance engines, the choice in head gaskets comes down to copper or MLS. Viton-coated stainless steel outer layers create a superior seal not available with other steel or copper gaskets. Block and Head Gasket. Gaskets. In most cases, the head gasket fails before the head cracks, but sometimes both can happen. Over time, a vehicle’s cylinder heads can warp and pit causing head gaskets to lose their seal which can lead to rough engine operation and loss of power. Lifetime warranty; Highest Grade Materials - MLS Head Gaskets are made from high grade Stainless steel materials. 7 vs stock 9. This feature is now available in the MLS part and the MLS will seal much more efficiently that the copper will. 001" thick Viton rubber that is bonded to the outer stainless steel layers MLS head gaskets reduce bore distortion but still can withstand extreme cylinder pressures. For over 100 years, Fel-Pro has been engineering and manufacturing sealing solutions designed for the repair environment. Copper head gasket has had an advantage, historically, in the fact that several thicknesses were available. Features: COMETIC H2138SP1027S . Dec 5, 2024 · Cometic Multi-Layer Steel MLS Gaskets are designed to create the best possible seal for naturally aspirated, boosted, or nitrous-fed engines. 5mm and 2. The gaskets are made of 3-5 layers of spring stainless steel, offering a stronger base material than standard cylinder head gaskets. 8L & 5. These gaskets will not burn or push out and requires no additional sealers. 9L (360 CID) engines. The head gaskets are made from three to five layers of spring stainless steel, offering a more resilient base material than standard head gaskets. He says the MLS gaskets are Fel-Pro PermaTorque MLS Head Gasket Small Block Chevy. NOTE: Specification MS35769 (AN-900) is available in most sizes. 001" thick Viton rubber that is bonded to the outer stainless steel layers Head Gaskets That Work the First Time. Toll Free: 87 PERMATEX (877-376-2839) 10 Columbus Blvd. These fine gaskets are equally potent in 500 horsepower street strip motors. The gaskets have excellent rebound characteristics and resist corrosive substances. They are made from C11000 ASTM B-152-92 copper sheets, annealed to Rockwell F-32 after manufacturing, Skin sealed in engine sets. Features: Fel-Pro® engineers incorporate the best features of their race-proven performance head gaskets into Fel-Pro® Marine stainless steel core head gaskets. Cometic Multi-Layer Steel (MLS) Gaskets are all designed to provide the best seal for naturally aspirated, boosted, or nitrous-fed engines. Performance. 001" thick Viton rubber that is bonded to the outer stainless steel layers Find the Fel-Pro part you need with our parts finder tool. permanently stop and seal head gasket leaks For nearly 70 years, Bar’s Leaks has served car owners with effective solutions to complicated problems like blown head gaskets and leaks related to engine oil, power steering, cooling systems, transmissions and more. Achieve a leak-tight connection while maintaining the high purity of a metal-to-metal seal connection with the Swagelok VCR® metal gasket face seals Fel-Pro PermaTorque® MLS Head Gasket Sealing Technology In the real world, nothing is perfect – including gasket sealing surfaces. These gaskets are designed specifically for 4-cycle marine engine applications, and their materials are compatible with both salt water and fresh water environments. Generally speaking, MLS gaskets are more than capable at 1,500-hp. MLS head gaskets reduce bore distortion but can still endure extreme cylinder pressures. But Fel-Pro MLS gaskets seal surfaces as rough as up to 80 Ra, making them ideal for the imperfect sealing surfaces found in the repair environment. Achieve a leak-tight connection while maintaining the high purity of a metal-to-metal seal connection with the Swagelok VCR® metal gasket face seals Jan 10, 2025 · MLS head gaskets reduce bore distortion but still can withstand extreme cylinder pressures. Fel-Pro 1011-2 Fel-Pro PermaTorque MLS Head Gasket Big Block Chevy Mark IV Marine. While today’s gasket makers and flange sealants can replace most conventional, formed, or multi-material gaskets, they should never be used to replace a head gasket. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head gasket leak). Head Gasket Sealant (1100) Block Seal Coolant Leak Fix Stop Leak (1109) Head Gasket Fix (1111) Blown Head Gasket Repair (HG-1) Cooling System. Nov 20, 2018 · Use and Misuse of Sealers. Each type of Fel-Pro head gasket – whether it be PermaTorque® MLS, PermaTorque, solid or perforated core, single layer embossed steel, or other types – all require specific surface finish requirements. 001" thick Viton rubber that is bonded to the outer stainless steel layers. SCE Gaskets find their way into race cars and tow vehicles because of their high performance design. 020” thicker material are available for 1989 to 1998 Dodge Ram / Cummins “B-series” 5. The Fel-Pro blog offers a series of informative articles, fun insights from Fel-Pro technicians, and much more! Get the answers you need here. $14. Nov 20, 2018 · Fel-Pro, ASE Certified Master Technician, John Gurnig explains how Fel-Pro gaskets are marked to show the installer which side of the engine they should be installed on, and – when critical to the repair – how they should be oriented to assure a 100% leak-proof seal. Before installing MLS head gaskets, check hardware thoroughly for nicks and damaged threads, this can effect A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. PERFORMANCE WIRE RING. This prevents engine builders and technicians from installing the best MLS designs in older engines of the GM LS series Permatex Copper Spray-A-Gasket Hi-Temp Sealant is a fast-drying, metallic copper sealant that helps dissipate heat, preventing gasket burnout and improving heat transfer. HEAD GASKET INSTALLATION TIPS 1. With these technical resources, Fel-Pro can help you seal less than perfect surfaces. Unlike these other types of gaskets, MLS gaskets use a different strategy to seal the combustion chamber. Next best would be a composite gasket. Nov 5, 2019 · SOUTHFIELD, Mich. 3mm on its import applications. Nov 12, 2024 · These head gaskets are made from 3 to 5 layers of spring stainless steel, offering a stronger base material than standard cylinder head gaskets. . Typically composite head gaskets have a steel core, usually perforated, with softer facing materials (graphite or aramid fiber) bonded on each side. 060" bore dia. Nov 2, 2017 · So, if you’re getting ready or even assembling your latest engine build, check out Head Gasket Tech: Pros & Cons of MLS and Copper. Adding an additional sealer can hinder the performance of an MLS head gasket. Modern facing materials and Fel-Pro's proprietary coatings will compensate for minor surface imperfections, resist scrubbing, and provide the proper amount of torque retention to create a true no-retorque head gasket. The weaker link of the two is the head gasket. The precise amount of coating is applied to the head gaskets to compensate for imperfect sealing surface finishes to create a reliable seal you can count on. Paul Svinicki from Paul's High Performance has a lot of experience with supercharged Cobras. PermaTorque MLS head gaskets feature an exclusive LaserWeld stopper layer technology design where applicable. Features: Jan 5, 2022 · Get the Best Performance with Fel-Pro Copper Wire Ring Head Gasket Ford 260/289/302/351W 1011-2 parts at JEGS. The head gaskets are made from 3-5 layers of spring stainless steel, offering a stronger base material than standard cylinder head gaskets. Manufactured from a high grade 301 stainless steel, MLS header gaskets feature an embossed spring steel bead which . This sophisticated technology provides a precisely determined limit to the compression of the multiple layers within the head gasket, while ensuring proper sealing stress between the cylinder head and block. 99 Lowest Price Guarantee Cometic Multilayer Steel (MLS) Gaskets are designed to provide the best possible seal for naturally-aspirated, boosted, or nitrous-fed engines. These head gaskets are made from 3 to 5 layers of spring stainless steel, offering a stronger base material than standard cylinder head gaskets. The precise amount of coating is applied to the head gaskets to compensate for surface finishes as rough as 80 Ra, which creates a reliable seal you can count on. Mar 3, 2003 · The Multi-Layer Steel (MLS) cylinder head gasket's combustion seal feature that we commonly refer to as a stopper, is a zone of the gasket at the bore opening which is thicker than the rest of the gasket. Click image to zoom. Proprietary NextGen Coating Technology - Precise amount of coating is applied to withstand higher engine temperatures and accommodate surface Nov 20, 2018 · Fel-Pro® has introduced PermaTorque® MLS Head Gaskets with NextGen Coating to help accommodate for today’s higher temperature engine environment. STYLE P-920 BOILER GASKETS Parker Style P-920 Gaskets are available in standard Gaskets. Bolt 'em Down We'd be remiss if we didn't discuss head bolts and/or studs when talking Aug 1, 2011 · Of course, if you're racing a 1,000-plus-hp dragster with forced induction or nitrous, then things like spraying your gaskets with a copper sealant or O-ringing the block may still be necessary. Designed for imperfect sealing surfaces found in the repair environment, this head gasket shares the same features that have made Fel-Pro’s PermaTorque MLS head gaskets a leader in engine repair. 2. 001" thick Viton rubber that is bonded to the outer stainless steel layers Head Gasket (1) Header Collector JEGS Copper Exhaust Gaskets. White smoke from the exhaust suggests that coolant is the repair environment. Header & Collector Gaskets for Your Exhaust. Jan 7, 2025 · These head gaskets are made from 3 to 5 layers of spring stainless steel, offering a stronger base material than standard cylinder head gaskets. Features. Jan 10, 2025 · Viton-coated stainless steel outer layers create a superior seal not available with other steel or copper gaskets. Made from Stainless Spring Steel to offer an extremely strong corrosion resistant head gasket; Each MLS head gasket is coated with a . Dec 21, 2023 · These gaskets endure even greater heat and pressure than manifold gaskets due to the enhanced performance demands. For gasket widths over 1/4", Parker Style P-923 Double-Jacketed Gaskets are suggested. Cometic Multilayer Steel (MLS) Gaskets are designed to provide the best possible seal for naturally-aspirated, boosted, or nitrous-fed engines. Typical MLS head gaskets can leak combustion pressure between gasket layers, block and cylinder head. legendary Pro Copper Head Gaskets, used and recommended by top professional teams to seal 7,000 horsepower Top Fuel motors. Gasket MLS Exhaust Header and Collector Gaskets. MLS head gaskets reduce bore distortion but still can withstand extreme cylinder pressures. Manufactured from three stainless steel layers, these gaskets resists corrosion, will not burn or push out and will maintain torque retention. Whether it’s an MLS head gasket that can survive the astronomical boost, a manifold gasket that will seal extreme crankcase vacuum, or a valve cover gasket that will maintain a leak-free seal after miles of full-throttle action, Fel-Pro® has the sealing package you need to win. These seals can be replaced if they leak or Viton-coated stainless steel outer layers create a superior seal not available with other steel or copper gaskets. I will be giving you a most basic run down of the basic kinds available to us folks in the performance world. 01 - $52. 001" thick Viton rubber that is bonded to the outer stainless steel layers The Jegs 555-21200 copper head gasket will work with 4. Feb 11, 2019 · MLS gaskets are designed with two to five sheets of spring or carbon steel sandwiched between the head gasket’s sealing material. $234. 5, 2019 /PRNewswire/ -- Fel-Pro(®) Gaskets, The Gasket Professionals Trust(TM) and a leading brand from DRiV Automotive Inc. Set contains MLS cylinder head gaskets, molded rubber valve cover and oil pan gaskets, intake manifold gaskets, MLS head gaskets reduce bore distortion but still withstand extreme cylinder pressures. Cometic MLS Cylinder Head Gaskets reduce bore distortion but can still endure extreme cylinder pressures. (Fig. *Sold 1 per package. Materials like reinforced MLS, copper, or composites are typically used for added durability. The New ICS TITAN with built in combustion seal blocks lateral flow of combustion pressure. DO NOT USE ANY TYPE OF GLUE OR SEALER ON MR. Sep 1, 2001 · The latest generation of gaskets are the copper or aluminum-frame gaskets. Sep 17, 2008 · MLS head gasket is the best for high performance applications. Upgrading your engine's header collector gaskets is a great way to increase sealing and gasket life. this style and at a lower cost than “french” type gaskets. MLS Versus Copper - Headgaskets Explained There are many brands and many different types of head gaskets to pick and choose from. Made from stainless spring steel for exceptional corrosion resistance Feb 29, 2012 · In addition to featuring more layers than most competing MLS gaskets, Fel-Pro PermaTorque MLS performance head gaskets are equipped with Federal-Mogul's exclusive LaserWeld(TM) stopper layer Set contains MLS cylinder head gaskets, molded rubber valve cover and oil pan gaskets, intake manifold gaskets, plus gaskets and seals required to reassemble engine. Product Q&A View Now. Therefore, it is important to understand the interaction between the engine head, block and head gasket. Some gaskets are asymmetric, and the correct orientation can be visually distinguished. Nov 11, 2024 · MLS head gaskets reduce bore distortion but still can withstand extreme cylinder pressures. The head gaskets are made from three to five layers of spring stainless steel, offering a stronger base material than standard head gaskets. 027" MLS HEAD GASKET EACH HOLDEN 304 308 V8 BORE 4. Fel-Pro® Performance exhaust header gaskets consist of a high-density fiber-facing material attached to both sides of a perforated steel core. All three are meant to deal with head gasket leaks, but there are differences. 075" thick multi-layer steel or MLS head gaskets that are the same bore size as a stock LSA or LS9 head gasket but are thicker so they reduce compression by roughly 0. The design of these new MLS head gaskets, offered as replace-ment parts for Ford engines, also provides improved heat transfer between the engine block and cylinder head. Unlike MLS head gaskets that may only be offered in a couple bore sizes and two or three thicknesses, copper head gaskets can be made to a custom bore size and many different thicknesses. , has developed the next generation of number 3802245), a head gasket set with . Fel-Pro, ASE Certified Master Technician, John Gurnig explains the features and benefits of Fel-Pro PermaTorque® MLS multi-layer steel head gaskets, including the embossed areas that seal oil drainbacks and high-pressure oil ports, the LaserWeld™ stopper layer that seals combustion openings, and a proprietary blue coating that seals surface Oct 16, 2012 · Most of the head gasket designs available for aftermarket use can be classified into two general categories – Composite and Steel (MLS). PERMATORQUE® MLS WITH LASERWELD™ LaserWeld™ is a patented head gasket stopper layer technology that precisely limits the compression of the gasket's multiple layers while ensuring proper Our new PermaTorque MLS head gasket with next generation coating helps to accommodate for today's higher temperature engine environment. 0L in 2002, the cylinder head gaskets were no longer interchangeable. Standard thickness available is 3/32". Jul 26, 2015 · Why does Cometic recommend MLS gaskets to be installed dry? Cometic Multi-Layer Steel (MLS) head gaskets go on dry because they are coated with a sealant. Sold individually. 1) Never replace a head gasket using a gasket maker. Answered by: jshook . Date published: 2023-03-07 JEGS 210036 - MLS Cylinder Head Gasket for Small Mar 4, 2002 · Multi-layer steel (MLS) cylinder head gaskets are becoming more widely used to seal an engine. Precisely shaped beads and stoppers work with the specific steel properties to increase the clamping force around the combustion chamber. You will surely get some valuable information, and might just save yourself some time and money by avoiding a costly mistake. Viton-coated outer layers create a superior seal not available with other steel or copper gaskets. ROUGHNESS AVERAGE (R a) Subaru cylinder head resurfaced for MLS gaskets Nov 20, 2018 · Quick Look At PermaTorque® MLS Head Gaskets. , Hartford, Connecticut 06106 6875 Parkland Boulevard, Solon Ohio 44139 Technical Data Sheet Aug 1, 2004 · Horse Sense: Ford SVT uses Cometic MLS gaskets on the '03-'04 Mustang Cobras. Oct 1, 2006 · The latest alternative to reinforced composite head gaskets and copper head gaskets for performance engines are MLS gaskets. Engine Oct 1, 2006 · Many racers who used to run copper heads gaskets have switched to MLS because the gaskets hold up just as well and don’t have the sealing or installation issues associated with copper gaskets. This high temperature sealant spray sealant instantly and fills hot spots and surface imperfections and resists all types of automotive fluids. Jan 23, 2007 · Yes, it sounds cool to say that you have high-performance head gaskets made from copper, or the latest MLS set on your engine, but before you build your next hard-running bullet, let's explore Designed for imperfect sealing surfaces found in the repair environment, this head gasket shares the same features that have made Fel-Pro’s PermaTorque MLS head gaskets a leader in engine repair. OEM MLS gaskets work well on new, flat, clean castings, since they require a very smooth surface finish, usually 20-30 R a or less. MLS Gaskets reduce bore distortion, resist corrosive substances, and have excellent rebound qualities. uieach xycfdnd cox tailmp qeenb risgs rpbsra zeldl xvrxfq eqokp