SKU: 3875978042

Cometic Chrysler 440 Siamese 4.50 inch Bore .040 inch MLS-5 Head Gasket

$115.20 $128.00
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Description

Cometic Chrysler 440 Siamese 4.50 inch Bore .040 inch MLS-5 Head GasketComprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0. 040". Cometic MLS (Multi Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two

Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0.040". Cometic MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flour elastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.

This Part Fits:

Year Make Model Submodel
1969-1974 Bristol 411 Base
1959-1971 Chrysler 300 Base
1962-1963 Chrysler 300 Sport
1975-1978 Chrysler Cordoba Base
1959-1967 Chrysler Imperial Base
1959-1970 Chrysler Imperial Crown
1959-1975 Chrysler Imperial LeBaron
1959-1974 Chrysler New Yorker Base
1972-1978 Chrysler New Yorker Brougham
1959-1971,1973-1978 Chrysler Newport Base
1967-1976 Chrysler Newport Custom
1971-1972 Chrysler Newport Royal
1959-1960 Chrysler Saratoga Base
1959-1977 Chrysler Town & Country Base
1959-1961 Chrysler Windsor Base
1959-1960 DeSoto Adventurer Base
1959 DeSoto Firedome Base
1959 DeSoto Fireflite Base
1963-1964 Dodge 330 Base
1963-1964 Dodge 440 Base
1962-1965 Dodge 880 Base
1962-1965 Dodge 880 Custom
1974 Dodge B100 Van Base
1974 Dodge B100 Van Sportsman
1975-1978 Dodge B200 Base
1971-1974 Dodge B200 Van Base
1972-1974 Dodge B200 Van Maxi
1972-1974 Dodge B200 Van Maxi Wagon
1971-1974 Dodge B200 Van Sportsman
1975-1978 Dodge B300 Base
1971-1974 Dodge B300 Van Base
1972-1974 Dodge B300 Van Maxi
1972-1974 Dodge B300 Van Maxi Wagon
1971-1974 Dodge B300 Van Sportsman
1976-1979 Dodge CB300 Base
1970-1974 Dodge Challenger Base
1970-1971 Dodge Challenger R/T
1972 Dodge Challenger Rallye
1969-1971 Dodge Charger 500
1966-1974,1976 Dodge Charger Base
1969 Dodge Charger Daytona
1967-1971 Dodge Charger R/T
1969 Dodge Charger SE
1971-1978 Dodge Charger Special Edition
1976 Dodge Charger Sport
1971 Dodge Charger Super Bee
1965-1970 Dodge Coronet 440
1965-1970 Dodge Coronet 500
1958-1959,1965-1966,1970-1976 Dodge Coronet Base
1971,1975-1976 Dodge Coronet Brougham
1971-1976 Dodge Coronet Crestwood
1971-1975 Dodge Coronet Custom
1966-1970 Dodge Coronet Deluxe
1967-1970 Dodge Coronet R/T
1968-1970 Dodge Coronet Super Bee
1958-1961 Dodge Custom Base
1975-1978 Dodge D100 Custom
1976-1978 Dodge D100 Warlock
1968-1974 Dodge D100 Pickup Base
1967 Dodge D100 Series Base
1977-1978 Dodge D150 Base
1978 Dodge D150 Li'l Red Express
1977-1978 Dodge D200 Base
1975-1976 Dodge D200 Custom
1968-1974 Dodge D200 Pickup Base
1967 Dodge D200 Series Base
1977-1978 Dodge D300 Base
1975-1976 Dodge D300 Custom
1968-1974 Dodge D300 Pickup Base
1967 Dodge D300 Series Base
1967-1968 Dodge Dart 270
1962 Dodge Dart 330
1962 Dodge Dart 440
1960-1962,1967-1969 Dodge Dart Base
1969 Dodge Dart Custom
1967-1969 Dodge Dart GT
1968-1969 Dodge Dart GTS
1960-1961 Dodge Dart Phoenix
1960-1961 Dodge Dart Pioneer
1969 Dodge Dart Swinger
1961 Dodge Lancer 170
1958-1959 Dodge Lancer Base
1978 Dodge Magnum XE
1960 Dodge Matador Base
1974 Dodge MB300 Base
1967-1968 Dodge Monaco 500
1965-1978 Dodge Monaco Base
1974,1977-1978 Dodge Monaco Brougham
1977-1978 Dodge Monaco Crestwood
1974 Dodge Monaco Custom
1975-1976 Dodge Monaco Royal
1975-1976 Dodge Monaco Royal Brougham
1960-1961 Dodge Phoenix Base
1961 Dodge Pioneer Base
1963,1968-1969 Dodge Polara 500
1960-1973 Dodge Polara Base
1971 Dodge Polara Brougham
1970-1973 Dodge Polara Custom
1970 Dodge Polara Special
1974-1978 Dodge Ramcharger Base
1975-1978 Dodge Ramcharger SE
1958-1959 Dodge Royal Base
1975-1977 Dodge Royal Monaco Base
1975-1977 Dodge Royal Monaco Brougham
1961 Dodge Seneca Base
1958-1959 Dodge Sierra Base
1958-1959 Dodge Sierra Custom
1958 Dodge Suburban Base
1975-1977 Dodge W100 Custom
1968-1974 Dodge W100 Pickup Base
1967 Dodge W100 Series Base
1977-1978 Dodge W150 Base
1975-1978 Dodge W200 Base
1968-1974 Dodge W200 Pickup Base
1967 Dodge W200 Series Base
1977-1978 Dodge W300 Base
1975-1976 Dodge W300 Custom
1968-1974 Dodge W300 Pickup Base
1967 Dodge W300 Series Base
1960-1963 Dual-Ghia L6.4 Base
1959-1963 Facel Vega Excellence Base
1962-1964 Facel Vega Facel II Base
1959-1961 Facel Vega HK500 Base
1964-1966 Jensen C-V8 Base
1967-1971 Jensen Interceptor FF
1967-1969 Jensen Interceptor MK I
1970-1971 Jensen Interceptor MK II
1972-1976 Jensen Interceptor MK III
1972-1973 Jensen Interceptor SP
1964,1967-1972 Plymouth Barracuda Base
1970-1971 Plymouth Barracuda Gran Coupe
1959-1970 Plymouth Belvedere Base
1968-1970 Plymouth Belvedere Satellite
1965-1967 Plymouth Belvedere II Base
1970-1972 Plymouth Cuda Base
1959-1961 Plymouth Custom Base
1960-1963 Plymouth Fleet Special Base
1959-1967,1975-1978 Plymouth Fury Base
1971,1975 Plymouth Fury Custom
1968,1970-1975 Plymouth Fury Custom Suburban
1970,1972 Plymouth Fury Gran Coupe
1972 Plymouth Fury Gran Sedan
1970 Plymouth Fury GT
1974 Plymouth Fury Police
1970 Plymouth Fury S-23
1976-1978 Plymouth Fury Salon
1959,1962-1971,1975-1978 Plymouth Fury Sport
1970-1971 Plymouth Fury Sport GT
1968,1970-1978 Plymouth Fury Sport Suburban
1968,1970-1978 Plymouth Fury Suburban
1966,1968-1969 Plymouth Fury VIP
1968-1974 Plymouth Fury I Base
1969,1971,1974 Plymouth Fury I Suburban
1965-1966,1968-1974 Plymouth Fury II Base
1968-1969,1973 Plymouth Fury II Custom Suburban
1965-1974 Plymouth Fury III Base
1968-1969 Plymouth Fury III Sport Suburban
1972-1977 Plymouth Gran Fury Base
1975-1977 Plymouth Gran Fury Brougham
1975-1976 Plymouth Gran Fury Custom
1972-1973,1975-1976 Plymouth Gran Fury Custom Suburban
1975-1977 Plymouth Gran Fury Sport
1972-1973,1975-1977 Plymouth Gran Fury Sport Suburban
1972-1973,1975-1977 Plymouth Gran Fury Suburban
1967-1971 Plymouth GTX Base
1976-1978 Plymouth PB200 Voyager
1974 Plymouth PB200 Van Voyager
1974 Plymouth PB200 Van Voyager EX
1974 Plymouth PB200 Van Voyager EX Wagon
1976-1978 Plymouth PB300 Voyager
1974 Plymouth PB300 Van Voyager
1974 Plymouth PB300 Van Voyager EX
1974 Plymouth PB300 Van Voyager EX Wagon
1968-1975 Plymouth Road Runner Base
1965-1974 Plymouth Satellite Base
1971 Plymouth Satellite Brougham
1971-1974 Plymouth Satellite Custom
1971-1974 Plymouth Satellite Regent
1971-1974 Plymouth Satellite Sebring
1971-1974 Plymouth Satellite Sebring Plus
1968-1970 Plymouth Satellite Sport
1959-1964 Plymouth Savoy Base
1960-1961 Plymouth Savoy Deluxe
1960-1961 Plymouth Sport Wagon Base
1958-1961 Plymouth Suburban Base
1960-1961 Plymouth Suburban Custom
1960-1961 Plymouth Suburban Sport
1970 Plymouth Superbird Base
1974-1978 Plymouth Trailduster Base
1967 Plymouth VIP Base
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3875978042

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4.1 ★★★★★
Based on 25 reviews
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Product Reviews
A
Verified Purchase
Andy
Lexington, US
★★★★★ 5
Made a big improvement in cabin noise—highly recommend
Model: SLH20025
Siless Hybrid made a huge difference in reducing noise in the floor of my truck cabin. In some areas, there was basically just bare sheet metal between the inside and outside, so adding this really helped the truck feel more solid and noticeably quieter on the road. I used Kilmat on the doors, and honestly I wish I had used Siless Hybrid there too, but it was too late by the time I realized the difference. This material is very sticky, easy to cut, and simple to apply, which made the install pretty smooth. Just a heads-up: the tacky side gets messy and will bond to clothing really easily, so be careful during installation. Overall, I’d definitely buy it again—great product with real results.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 2, 2025
A
Verified Purchase
AmazinFrank
Chelsea, US
★★★★★ 5
Very good product at a fair price
Model: SLH20025
Very good sound deadener and heat shield, it is a bit sticky to work with, but easy to shape and cut
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
E
Verified Purchase
Eric Caldeira
Louisville, US
★★★★★ 5
I wish I had Siless 20 years ago!!!
Model: SLH20025, Model: SLH20025
I have installed all kinds of insulation in vehicles over many years. I only needed to purchase 2 boxes to complete the entire interior siding of my 2025 chevy express, what a great value! I wanted to insulate my locksmith van for sound and heat. The sound reduction virtually eliminated the road noise. These panels also look amazing. It got up to 110F in the sun with the doors closed. After adding Siless insulation the temperature maxed out at 97F. That is a massive difference. Plus, I didn't even finish with the roof before testing. Siless Hybrid 3in1 was extremely easy to cut and adhere onto metal panels. I'm impressed with the quality of the individual panels and the adhesive is not toxic smelling compared to some others. My favorite thing about these panels is you can actually take them off and readjust them before they finally stick and they do not leave any black residue behind when you pull them up to adjust them. All I needed was a heat gun, knife and a roller to complete this job. The size of each panel is perfect, you can handle them with ease. I probably won't need your product again for a while, but when I do I will definitely be back.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 21, 2025
M
Verified Purchase
Mark Kadrich
Los Angeles, US
★★★★★ 5
Works well and is easy to install.
Model: SLH20025, Model: SLH20025
I was sound and heat insulating a generator bay in my class A RV so I did three tests before and during material application: I did a sound level test to see how effective the material was for my application, a "stickiness" test, and a flammability test. This was indoors on a dry 78°F day. From beginning to end, the entire process, including testing, took 5 hours to install 25 sqft or material in a very complex area. One hour for cleaning, 3 hours for installation, and 1 hour for test setup and testing. Using a sound meter, I took before and after readings and determined that I reduced the sound level by 2.2 db (40% energy decrease) with a noticeable decrease in sound and frequency. The generator bay is located under the master bedroom in the aft portion of the coach. The sound went from a rattling, vibrating generator noise to a more tolerable low level rumble. The material was easy to apply. I did some testing prior to application and determined that surface preparation is key. I cleaned my painted metal surface and then degreased with acetone and the material stuck well. Be careful and purposeful when you apply the material because once it was stuck to the metal, it was quite difficult to remove or reposition. Since it was going to be installed into a gasoline powered generator bay located under our sleeping quarters, I did some flame testing to determine the level of risk. Although not highly flammable after installation, my testing revealed that the PE used will catch on fire under certain circumstances. In order to reduce the risk, I used aluminized duct tape to ensure that all the edges were sealed and the PE was not exposed to direct flame in the event of a fire. I also decided to install an automatic fire extinguisher as an added precaution. In all fairness there should be one installed in the generator bay anyway. All in all, I am very satisfied with the product and the results. I have recommended this product to my other RV owner friends.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 13, 2025
J
Verified Purchase
Josh
Los Angeles, US
★★★★★ 5
Great product. Best value i could find
Model: SLH20025
I'm using talk to text, so forgive any grammatical and spelling errors. I ordered this product after doing a bit of research on sound dampening materials. I had been doing car stereo for quite some time since my teens. Itook a break for 20 years or so. I'm now 40 and back in the day there was dynamat. And that was about it. as irecently bought a new 2017 F350 crew cab. I wanted to put in a new stereo system and being that it was my dream truck. I was going to put in my dream stereo. But before I could do that, I needed to start with the sound deadening. I looked into today's leading product and found a company called resonx. Had taken their place as king of the hill in sound deadly. I researched their products and found the materials they were built from and Silas was the closest match at the best price I used Silas Max. First, then Silas 3 and 1 hybrid over that on all exterior panels. Then, on the interior panels. I used the 3 and 1 hybrid . on the floor I used Silas Max. Then, the 3 and 1 hybrid, then Silas liner over that the car is incredibly quiet . As far as sound dampening and deadening, it works very well for the money really can't beat it. Do your homework no How and where to apply it? And you really can't go wrong or about $400. I did. What would have cost me easily? Two thousand in other brands highly recommend the product prep work.Is everything do your homework?Do it right and you will be happy with this stuff
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026

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