Oct 26, 2020 · Some later blocks also allow for the use of roller cams instead of flat tappet. Do you know the difference between a 351w, a 351 Cleveland, a 351 Modified, or a 351 HO? In the battle of 351 Windsor Vs 351 Cleveland, why should you pick the Windsor even though the Cleveland is a more powerful engine? This video goes into all that and even more. Sep 15, 2002 ... 351 w 351 c 351 m 400 429 460 Ford distributor interchange ... Just in case you did not know, a 351 c, 351 m, 400, 429 and 460 distributors all ...In today’s digital world, the ability to edit and modify PDF documents has become essential. Whether you are a student, professional, or just an everyday computer user, chances are...Stealth Black Ford 351C, 351M & 400 V-Belt System - Alternator Only with Electric Water Pump. Ford. MSRP: $344.00. $294.00. B-351C-ALT-SYSTEM-EWP. A v-belt pulley system for the Ford 351C, 351M and 400 engines with mechanical or electric water pump. Pulleys, Brackets and hardware included. Made from 6061-T6 aluminum right here in the USA.🛠️ Download our free guide: The tools you need to work on your Mustang! https://bit.ly/465MGQT Ford has offered a 351 cubic inch engine in several different...Leave 1/4 inch between stud and bottom. Use engine oil sparingly on stud threads; however, never fill the bolt hole with oil, which can crack the block. Before a 351C block can be line-honed, torque the main studs. Apply moly coat to provide lubrication and an accurate torque reading.What makes the 351C different is a dry intake manifold void of cooling passages. The arrows indicate cooling passage modifications to get the BOSS 302 head to work on a 351C. And, 351C wedge heads can be modified to work on a BOSS 302. (Image/Jim Smart)FORD 5.8L/351 Timing Covers. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 21 of 21 25 Records Per Page Default Sort . Ford Performance Parts Timing Chain Covers M-6059-D351. Ford Performance Parts Timing Chain Covers M-6059-D351 ...What makes the 351C different is a dry intake manifold void of cooling passages. The arrows indicate cooling passage modifications to get the BOSS 302 head to work on a 351C. And, 351C wedge heads …Jun 1, 2006 · Ford's 351 Cleveland is legendary for the performance it has given us for 36 years. However, we admit to being confused by Ford's decision to manufacture the 351C . It already had the 351W, a ... Details. This MABBCO crankshaft kit is for a Ford 351M 5.8, model years 1975-1982. This crankshaft is identifiable by its #1K, #1KA, or #8M crank casting number and is commonly known as a "Modified." MABBCO crankshafts are cleaned, inspected, and ground on a world-class Italian crankgrinder.Trump administration policymakers built a major loophole into the new role for food companies to jump through. Two bottles of soybean oil sit on a grocery store shelf. Both contain...The 400M was first introduced in the 1971 Full-size model cars and station wagons. It was developed as an economical, reduced emissions replacement for the larger, gas-guzzling 429/460 and the ageing 360/390/428 V8 engines. The 351M was developed in 1975 to replace the 351C for use in large passenger cars. The 351M/400 engines were used in ...🛠️ Download our free guide: The tools you need to work on your Mustang! https://bit.ly/465MGQT Ford has offered a 351 cubic inch engine in several different...351 Modified is the odd man out but can be made to be a screamer with better heads and compression. Joe you should build a 400 for those massive 4v heads. At that point its just a tall deck cleveland. Windsor has the bigger main bearings. There is one more 351 ford; the sportsman N351. Find FORD 5.8L/351 Ford Modified Head Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! ... Head Gaskets, RCC, 4.060 in. Bore, 0.060 in. Thickness ... Ford's 351 Cleveland is legendary for the performance it has given us for 36 years. However, we admit to being confused by Ford's decision to manufacture the 351C . It already had the 351W, a ...The 351M is a sharp break form the other 351 engines because it is more similar to the Ford 400 engine. The last traditional 351 year was 1974; Ford decided to manufacture the 351M after that. It was used in the Ford F-150, 250, 350 and the Ford Bronco from 1977 to 1979. You can purchase a rebuilt Ford 351 on the aftermarket. Trick Flow® Cast Aluminum Valve Covers for Ford 351C, 351M/400, and Clevor TFS-51600802. Valve Cover, Tall Height, Cast Aluminum, Silver Powdercoated, Ford 351C, 351M, 400M, and Clevor, Pair. Part Number: TFS-51600802. Not Yet Reviewed. Estimated Ship Date: Aug 15, 2024 if ordered today. Howards Cams Street Force 1 Hydraulic Flat Tappet Camshaft and lifter Kits CL230011-12. Cam and Lifters, Street Force 1, Hydraulic Flat Tappet, Advertised Duration 259/269, Lift .484/.514, Ford, 351C, 351M,400, Kit. Part Number: HRS-CL230011-12.351M Firing Order- Doubting Myself. I'm wiring up the engine and started to doubt myself regarding the 351M firing order. On the distributor cap there's a #1 printed on the cap. This is truly the #1 position on the cap - Twp spots to the right of the clip?. I'm seeing other firing order diagrams on the web that don't make sense to me.Ford 351 5.8L with 425 HP Crate High Performance Motor Special Internet Price $6,699.00 This Eddies Performance Ford 351 5.8L Engine boasts 425 HP and includes a Edelbrock carburator and Performance Aluminum Heads. Listed are the engine specifications for our Ford 351W with 425 HP High Performance High Voltage HEI Distributor W/Coil A/C Spark PlugsTurboTax is a tax-preparation application that makes it easier to fill out your tax return and file it online. Financial data can be imported into TurboTax or entered manually. If ...Fill out a custom engine quote form and we will get a kit priced for you. All kits consist of assembled heads, intake manifold and camshaft. Horsepower 370 Torque 420 351cid. Horsepower 420 Torque 460 400cid. Runs on 93 octane with medium aggressive camshaft. Your provided OEM Iron cores heads mild ported. Custom speced camshaft.Jan 20, 2021 · With borrowed geometry from the upcoming 351 Cleveland, the Boss 302 heads featured a canted valve design, which allowed for huge valves and ports. These free-breathing cylinder heads favored high-rpm use and provided 290 hp at 5,200 rpm and 290 lb-ft of torque at 4,300 rpm in stock form. The Boss 302 engine was only available in 1969 and 1970 ... 351 Modified vs. 351 Cleveland. I currently have a 351Modified in my 1979 F150 4WD now. It's just a stock motor with a cheap carb. and everything. Nothing fancy. I am getting ready to restore the truck though, and want to go thru the motor or change it or something. Someone told me that the 351M wasn't a very good engine compared to the ...351 Engine Specifications. Ford offered two versions of the 351 engine, a Windsor 351 and a Cleveland 351. The Windsor motor is considered a small block. The Cleveland 351 is between a small block and a big block. Even though the Cleveland 351 came from the small block family, few parts will interchange. The heads on the 351 4 barrel engine ...The Ford V8 engine family tree has a lot of branches. You’ve got the venerable Windsor small block, plus the 385-series and FE-series big block branches, along with a trio of 351 engines—the 351 Windsor, Cleveland, and Modified.We’re now into the overhead-cam Modular motors, which advanced the Ford V8 into the 21st century.. So, …351 Engine Specifications. Ford offered two versions of the 351 engine, a Windsor 351 and a Cleveland 351. The Windsor motor is considered a small block. The Cleveland 351 is between a small block and a big block. Even though the Cleveland 351 came from the small block family, few parts will interchange. The heads on the 351 4 barrel engine ...The KAT6B gene provides instructions for making a type of enzyme called a histone acetyltransferase. Learn about this gene and related health conditions. The KAT6B gene provides in...351 MODIFIED. The 351M is part of the same Ford 335 V8 engine series as the 351 Cleveland. It’s based off of the 400 Modified engine (see note on nomenclature in opening paragraph), which was essentially a 351C with a longer stroke. Unlike the 351C however, the 400 block had the bellhousing bolt pattern of 385-series big blocks.Restructuring a mortgage is changing the terms and conditions, usually to accommodate your budget and save money. There are several ways to restructure your mortgage. The governmen...The BoxWrench Engine Specs Database is a community resource for mechanics of all skill levels to access a reference library of Firing Orders, Distributor Rotation Directions and Block-Cylinder Numbering as well as Torque Specs, Timing Settings and Cylinder Head Tightening Sequences among other engine specs.Federal Mogul Engine Re-Ring Kits 205624M-000. Engine Re-Ring, Moly, 4 in. Bore, Standard Rod, Standard Main, Ford, 351/400, Kit. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Engine Rebuild Kits and get Free Shipping on Orders Over $109 at Summit Racing!Details. This MABBCO® Remanufactured Short Block is for a Ford 5.8 351 Modified motor, model years 1975-1982. Each MABBCO® short block is custom assembled as ordered so please call for current build times. MABBCO® short blocks include NEW pistons, piston rings, rod bearings, main bearings, cam bearings, timing set, and freeze plugs.Jan 29, 2024 ... 17:16 · Go to channel · 351 Small Block Dyno Shootout: Windsor vs Cleveland - HorsePower S16, E11. POWERNATION•1.7M views · 10:28 · Go ...In this video, I explain the cylinder numbering and firing order of a Ford #51M or 400 found in our Bronco and other vehicles. Thanks for watching! Don't fo...The 351W is one of three engines that Ford released with 351 cubic inches of displacement. For that reason, many people get confused or mix up the 351 Windsor with the other two 351ci engines including the 351 Cleveland and 351M (for “modified” or “Michigan”).Apr 5, 2020 ... Your browser can't play this video. Learn more.FORD 5.8L/351 Ford Modified Distributors. Filter by Availability Filter Results Filter by Vehicle ... Distributor, Pro-Billet Ready-to-Run, Magnetic Pickup, Vacuum Advance, Ford, Big Block, Cleveland, Modified, Each. Part Number: MSD-8350. 3.95 out of 5 stars. Estimated Ship Date: Today. Free Shipping...Loading Estimated Ship Date: Today.Quickfuel carb and MSD distributor. Polished aluminum valve covers. Complete and dyno tuned. Minimum cost Level 1 $11700 parts, machined block and assembled heads. Minimum cost Level 2 $12500 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $16400 Complete dyno tuned engine. Example engine. Find FORD 5.8L/351 Ford Modified Engines & Components and get Free Shipping on Orders Over $109 at Summit Racing! ... 62cc Chamber, 1.55" Spring, Ford, Cleveland ... Jul 31, 2017 ... In this video I am removing my 351M out of my 1978 Ford Bronco. Links: Oil Cooler Adapters http://amzn.to/2w0hj9n http://amzn.to/2hiR4rw ...Howards Cams Street Force 1 Hydraulic Flat Tappet Camshaft and lifter Kits CL230011-12. Cam and Lifters, Street Force 1, Hydraulic Flat Tappet, Advertised Duration 259/269, Lift .484/.514, Ford, 351C, 351M,400, Kit. Part Number: HRS-CL230011-12.MSD Iridium Spark Plugs 3744. Spark Plug, 16IR5Y, Iridium Core, Tapered Seat, 18mm Thread, 0.437 in. Reach, Projected Tip, Resistor, Each. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing!The 1934 Ford Coupe is a classic car that holds a special place in the hearts of automobile enthusiasts. Its timeless design and iconic features make it a popular choice for those ...Quickfuel carb and MSD distributor. Polished aluminum valve covers. Complete and dyno tuned. Minimum cost Level 1 $11700 parts, machined block and assembled heads. Minimum cost Level 2 $12500 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $16400 Complete dyno tuned engine. Example engine.by John Thompson. October 13, 2023. The 351 cleveland can be identified by its taller deck height and larger intake ports. This engine was produced by ford from 1969 to 1974 and is known for its performance capabilities and durability. Introduced by ford in 1969, the 351 cleveland is a high-performance engine that was produced until 1974.Jan 22, 2012 ... I have a 79 F-100 dent side with a 351 M. I was adjusting the 4 barrel as I was get crappy mpg. Got the truck running great then checked the ...FORD 5.8L/351 Ford Modified Valve Covers & Dress-Up Kits. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 25 of 39 25 Records Per Page Default Sort . Ford Performance Parts Aluminum Valve Covers M-6582-Z351. Ford Performance Parts Aluminum Valve Covers M-6582-Z351 ...Nov 10, 2019 ... ... Engines Explained #engine. CJ Pony Parts•351K views · 15:38. Go to channel · Assembling a Ford 351 Modified 5.8 liter V8 Engine for # ...Nov 10, 2019 ... ... Engines Explained #engine. CJ Pony Parts•351K views · 15:38. Go to channel · Assembling a Ford 351 Modified 5.8 liter V8 Engine for # ...The 1971 and 1972 M-block 400 makes a good example to compare gross (260hp) and net (172hp) power ratings. There was no significant change in the 400’s specification (compression ratio, camshaft profile and timing, etc.) from 1971 to 1972, yet the advertised power rating dropped by about 33%. That lower rating was entirely a result of ...Until now, there weren't many options available when it came to aftermarket head selection for the Clevelands. Now, that's all changed with the Performer RPM head for 351-C. Designed to work with the 351-C, 351-M, and 400-M, they feature very streetable 190cc intake runners with 2.05"" intake and 1.60"" exhaust valves that provide more than …Find FORD 5.8L/351 Ford Cleveland Holley Sniper and get Free Shipping on Orders Over $109 at Summit Racing! $5 ... Sniper EFI, HyperSpark, HEI Cap, Hall Effect, Billet Housing, Black, Ignition Module, Ford, Modified, 351 Cleveland, Big Block 385, Each. Part Number: SNE-565-303BK. Not Yet Reviewed. Estimated Ship Date: Tomorrow. …Transmission options for the 400/351M. I'd like to make a list of transmission options for the 400 and 351m. Please note If it's manual or automatic, number of speeds, granny first and/or overdrive, if it is a direct bolt up, requires an adapter/spacer, ect. Big block C6 - automatic, 3 speed, direct bolt up. C6 3-speed auto, …Understanding the best ways to modify your home loan requires financial expertise, especially when you’re facing a foreclosure. Here’s a look at how to modify your home loan. When ...Trick Flow® PowerPort® Cleveland 195 Cylinder Heads for Ford 351C, 351M/400 and Clevor TFS-51616204-C00. Cylinder Head, PowerPort® Cleveland 195, CNC Street Ported, Assy, 62cc Chamber, 1.55" Spring, Ford, Cleveland, Modified, Each. Part Number: TFS-51616204-C00. ( 8 ) Estimated Ship Date: Today.351 Modified; Originally developed as a Truck motor, 351/400 M are similar in design to the 351C, but have some differences. Both blocks are ...351 Modified Stands On Its Own The final example of the 351 lineup is known as the 351M -- standing for "Modified" or "Michigan," depending on who you ask. Ford never issued an official clarification.Ford Performance Parts Oil Pump Pickups M-6622-DRS351. Oil Pump Pickup, Stock, Screw-In, 9.100 in. Pan Depth, Ford, 351W, For Rear Sump Pans, Each. Part Number: FMS-M6622DRS351. ( 2 ) Estimated Ship Date: Jun 4, 2024 if ordered today.FORD 5.8L/351 Connecting Rods. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 25 of 46 25 Records Per Page Default Sort . Scat Pro Stock I-Beam Connecting Rods 2-ICR5400-927. Scat Pro Stock I-Beam Connecting Rods 2-ICR5400-927 ...Some claim the "M" stands for “Modified” - being modified from a 400 V8 with a shortened stroke - though others claim that the "M" refers to the Michigan Casting Center, where the 351M began production. There is also some who say that the "M" designation has no official meaning, and it was just Ford's way of distinguishing the …These blocks were produced during the oil crisis and CA emissions b.s., and although the "m" stands for modified, it in no way reflected the modifications toward performance. ... 351Cleveland, 351Modified=400, have interchangeble heads, along with the 428 I believe. The 351 windsor, 302 windsor or any small block Ford, for that matter, …FORD 5.8L/351 Ford Modified Flywheels. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 14 of 14 25 Records Per Page Default Sort . McLeod Aluminum Flywheels 563100. McLeod Aluminum Flywheels 563100 ...The motor mounts on a Cleveland and Windsor are the same, the 351M is quit a bit different, 351c amd M have the same valve covers while the Windsor is the same as the 289,302. Clevelands are good if they are built right 351M are good for scrap iron and the Windsor is the best of the bunch. Leave 1/4 inch between stud and bottom. Use engine oil sparingly on stud threads; however, never fill the bolt hole with oil, which can crack the block. Before a 351C block can be line-honed, torque the main studs. Apply moly coat to provide lubrication and an accurate torque reading. Jan 29, 2024 ... 17:16 · Go to channel · 351 Small Block Dyno Shootout: Windsor vs Cleveland - HorsePower S16, E11. POWERNATION•1.7M views · 10:28 · Go ...Jan 17, 2014 · Top Aftermarket Upgrades. According to Summit Racing, these Ford 351 Windsor parts are the most readily available (number of options as of 1/16/2014 in parenthesis): Lifters (68) Distributors (50) Valve Covers (49) Cylinder Heads (47) Camshafts (47) Exhaust Header and Manifold Gaskets (44) Rocker Arms (43) Jul 28, 2021 · The 351C has a 9.206-inch deck height. The 351M and 400 have a taller deck at 10.297 inches. Cleveland crankshafts all look the same, however, they are different. The 4M crank has a 3.500-inch stroke and a 2.750-inch main journal. The 400 crank has a larger 3.000-inch main journal and a 5M stamp. May 19, 2013 · I know, I know, just get a 400M or 460, right? Except the truck I bought has a BRAND NEW JASPER rebuilt 351 modified in it. Runs good, but its a dog. My goal is to improve low-end torque, dependability and maybe an MPG or two. Considering its a fresh rebuild from a reputable company, NOW would be the best time for a cam swap/timing set/intake, etc. FORD 5.8L/351 Ford Modified Wiring Harnesses. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 5 of 5 25 Records Per Page Default Sort . Painless Performance 21-Circuit 1967-77 Direct-Fit Ford F-Series Harnesses 10117 ...Oct 2, 2011 ... ... 351m or 400. ... But I'm a bit biased, I'm debating swaping ... One thing I hear from alot of people is to not over-bore these 351-400 series ...335 Series- 5.8/351M, 6.6/400, 351 Cleveland - 351M oil capacity - I have a351 modified in my truck, there is no dipstick the guy before me temperarly plugged it up, so does anyone know where i can find one, also how much oil does it hold, i dont want to put to much in it before i get the dipstickUpgraded 351 Cleveland Carburetor. Best 351 Cleveland Carburetor Recommendation: Holley HP 650-cfm Carburetor. It is widely concluded that the 351 …Home > Engines > Ford > Ford 351 modified 75-82 engine 351m : Alternative Views: FORD 351M 75-82 COMP ENG Our Price: $ 3,049.00.Buy in monthly payments with Affirm on orders over $50. Learn more. Description. Additional Information. Ford C6 Stock Built Transmission Big Block 351M 400M 429 and 460. 3Yr Warranty*/Unlimited Mileage Warranty. Includes: Stock Remanufactured Torque Converter. Raybestos Hi-Energy Clutches.Shaving 0.010" will increase the compression ratio by approximately 2.3%. So, if your stock 400M has 8.5 to 1 CR, it will now have approximately 8.7 to 1 CR. About the most material you can reasonably remove from your stock 351M/400 heads is 0.025", which would increase your CR by approximately 5.75% which would give a 400 a CR of 8.98875.ATK High Performance Ford 351W 300 HP Stage 1 Long Block Crate Engines HP09. Engine Assembly, Stage 1 Crate Engine, Long Block, 1-Piece Main Seal, Ford, Small Block Windsor, 351, Each. Part Number:HPE-HP09. ( 5 ) …Milodon 30927 - Ford Cleveland/Modified Oil Pan 351C/400M. Add To Cart. $459.95. Milodon. Details. Ford. These early chassis, pre 1974 front sump, low profile designs provide both increased oil capacity, as well as maximum available ground clearance. Increased oil capacity is an absolute requirement to handle the demands of higher RPM …Find FORD 5.8L/351 Ford Modified Intake Manifold Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... 0.060 in. Thickness, Ford, Cleveland, Modified, 0.120 in. Thickness, Pair. Part Number: FOG-8054-2. Not Yet Reviewed. Estimated Ship Date: …Find FORD 5.8L/351 Ford Modified Headers and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App ... Headers, Clippster, Mid-Length, Steel, Natural, Ford Cleveland, Modified, Each. Part Number: PTE-H8435. 4.25 out of 5 stars. Estimated Ship Date: Today. 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Shaving 0.010" will increase the compression ratio by approximately 2.3%. So, if your stock 400M has 8.5 to 1 CR, it will now have approximately 8.7 to 1 CR. About the most material you can reasonably remove from your stock 351M/400 heads is 0.025", which would increase your CR by approximately 5.75% which would give a 400 a CR of 8.98875. Intake Combo, Weiand Action Plus, Ford, Modified, 351/400, Bolts, Gaskets, RTV Sealer, Carburetor Studs, Kit. Part Number: CMB-03-0122 4.5 out of 5 stars Mar 5, 2024 · The 351 Cleveland is perhaps the most famed, with its canted-valve cylinder heads giving it a performance edge; the Cleveland is easily identified by its larger port heads and closed wedge chambers. The Boss 351, a high-performance version of the Cleveland, came equipped in the Mustang and is a rare, sought-after model. CFM Requirement = (Engine Displacement x Maximum RPM) ÷ 3,436. For example: 351 ci x 6,500 rpm ÷ 3,456 = 660 cfm. Most high-performance street Clevelands need no more than a 650-cfm 4-barrel carburetor. It is when you get into high RPM and greater displacement that you need a larger carburetor (more CFM). Professional Products PowerForce Harmonic Dampers 80006. Harmonic Balancer, Powerforce Series, 28 oz. External Balance, Nodular Iron, Black, Ford, 260, 289, 302, 351W, Each. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Parts and Accessories and get Free Shipping on Orders Over $109 at Summit Racing! Find FORD 5.8L/351 Intake Manifold and Carburetor Combos and get Free Shipping on Orders Over $109 at Summit Racing!The Ford 400 Modified Long Block includes: Advertised power- 375hp / 450tq. Reman 335 Block. 4 coats of high quality ceramic engine paint. We have our engines professionally sprayed with a 2 part paint just like you would use on a car but a special high temp version. This is not a cheap “rattle can” paint job that will wear off.Some later blocks also allow for the use of roller cams instead of flat tappet. Do you know the difference between a 351w, a 351 Cleveland, a 351 Modified, or a 351 HO? In the battle of 351 Windsor Vs 351 Cleveland, why should you pick the Windsor even though the Cleveland is a more powerful engine? This video goes into all that and even … Sanderson Headers Blockhugger Headers FC1-SEC. Headers, Block Hugger, Steel, Silver Ceramic Coated, 3.0 in. Collector, Ford, Pair. Estimated Ship Date: Jul 22, 2024 if ordered today. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Headers and get Free Shipping on Orders Over $109 at Summit Racing! Apr 4, 2009 ... Here are a couple articles you may find interesting as far as rodding 351/400M's. ... It is said that the "M" stands for modified. These engines ...Details. This MABBCO crankshaft kit is for a Ford 351M 5.8, model years 1975-1982. This crankshaft is identifiable by its #1K, #1KA, or #8M crank casting number and is commonly known as a "Modified." MABBCO crankshafts are cleaned, inspected, and ground on a world-class Italian crankgrinder.VALVE COVER GASKET for FORD 351 CLEVELAND, 351 Modified and 400 CID. Part # RG-50068FR. Set of two "Ultimate" silicone gaskets. "Ultimate" silicone gaskets are where a layer of fiberglass is centered between 2 layers of silicone. This is a super strong gasket. It is reusable. Made in the USA..