Cylinder Head Gasket Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 .045" MLS , 4.630" Bore, For Aftermarket Heads - Undersized Water Ports to Allow for Customization Cometic C5434-045
SKU: 45625388291

Cylinder Head Gasket Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 .045" MLS , 4.630" Bore, For Aftermarket Heads - Undersized Water Ports to Allow for Customization Cometic C5434-045

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Description

Cylinder Head Gasket Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 .045" MLS , 4.630" Bore, For Aftermarket Heads - Undersized Water Ports to Allow for Customization Cometic C5434-045Cometic C5434 045 Chevrolet Mark IV, GM Gen V VI Big Block V8 . 045" MLS Cylinder Head Gasket, 4. 630" Bore, For Aftermarket Heads Undersized Water Ports to Allow for Customization Details: Material: MLS Compressed Thickness: . 045 Bore Shape: Valve Pocketed Bore Size (IN): 4. 630 # of layers: 3 Orientation: None Application list: Chevrolet Bel Air (1965 1975) Biscayne (1965 1972) Blazer (1973 1974) Brookwood (1969 1972) C10 (1975 1980) C10 Pickup

Cometic C5434-045 Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 .045" MLS Cylinder Head Gasket, 4.630" Bore, For Aftermarket Heads - Undersized Water Ports to Allow for Customization

Details:

  • Material: MLS
  • Compressed Thickness: .045
  • Bore Shape: Valve Pocketed
  • Bore Size (IN): 4.630
  • # of layers: 3
  • Orientation: None

Application list:

Chevrolet
    Bel Air (1965-1975)
    Biscayne (1965-1972)
    Blazer (1973-1974)
    Brookwood (1969-1972)
    C10 (1975-1980)
    C10 Pickup (1968-1974)
    C10 Suburban (1968-1980)
    C1500 (1990)
    C20 (1975-1986)
    C20 Pickup (1968-1974)
    C20 Suburban (1968-1986)
    C30 (1975-1986)
    C30 Pickup (1968-1974)
    C3500 (1988-1990)
    Camaro (1967-1972)
    Caprice (1966-1976)
    Chevelle (1965-1973)
    Chevy II (1968)
    Corvette (1965-1974)
    El Camino (1966-1975)
    Estate (1969-1970)
    G10 Van (1973-1974)
    G20 (1976)
    G20 Van (1973-1974)
    G30 (1975-1976, 1988-1990)
    G30 Van (1973-1974, 1988-1990)
    Impala (1965-1976)
    K10 (1976-1976, 1979-1980)
    K10 Pickup (1968-1974)
    K10 Suburban (1968-1974)
    K20 (1976)
    K20 Pickup (1968-1974)
    K20 Suburban (1968)
    K30 (1977-1977, 1980-1986)
    K30 Pickup (1968-1974)
    K3500 (1988-1990)
    K5 Blazer (1976-1978)
    Kingswood (1969-1972)
    Laguna (1973-1975)
    Malibu (1965-1967, 1973-1975)
    Monte Carlo (1970-1975)
    Nova (1969-1972)
    P10 Van (1973)
    P20 (1976)
    P20 Van (1970)
    P30 (1975-1989)
    P30 Van (1970-1974)
    R20 (1987-1988)
    R20 Suburban (1987-1988)
    R2500 (1989)
    R2500 Suburban (1989-1990)
    R30 (1987-1988)
    R3500 (1989-1990)
    Townsman (1969-1972)
    V20 Suburban (1987-1988)
    V2500 Suburban (1990)
    V30 (1987-1988)
    V3500 (1989-1990)
GMC
    C15 Suburban (1975-1978)
    C15/C1500 Suburban (1968-1974)
    C1500 Pickup (1968-1980)
    C1500 Suburban (1979-1980)
    C25 Suburban (1975-1978)
    C25/C2500 Pickup (1968-1978)
    C25/C2500 Suburban (1968-1974)
    C2500 Pickup (1979-1986)
    C2500 Suburban (1979-1986)
    C35/C3500 Pickup (1968-1978)
    C3500 Pickup (1979-1986, 1988-1990)
    G25/G2500 Van (1975-1976)
    G35/G3500 Van (1973-1974, 1976-1976, 1988-1990)
    Jimmy (1973)
    K15/K1500 Pickup (1968)
    K15/K1500 Suburban (1968-1974)
    K1500 Pickup (1968-1974, 1976-1976, 1979-1980)
    K25 Pickup (1976-1978)
    K25 Suburban (1976-1977)
    K25/K2500 Pickup (1968-1974)
    K25/K2500 Suburban (1968-1974)
    K35/K3500 Pickup (1968-1974)
    K3500 Pickup (1979-1986, 1988-1990)
    P15/P1500 Van (1979)
    P25/P2500 Van (1970-1971)
    P35 Van (1975-1978)
    P35/P3500 Van (1970-1971, 1973-1974)
    P3500 Van (1979-1989)
    R2500 Pickup (1987-1989)
    R2500 Suburban (1987-1990)
    R3500 Pickup (1987-1990)
    Sprint (1971-1975)
    V3500 Pickup (1987-1990)
Pontiac
    Acadian (1968-1971)
    Beaumont (1965-1969)
    Laurentian (1966-1970)
    Parisienne (1966-1970)
    Strato-Chief (1965-1970)

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 45625388291

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4.8 ★★★★★
Based on 1810 reviews
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Product Reviews
K
Verified Purchase
Kindle Customer
Charlottesville, US
★★★★★ 4
Really wanted to love these
Size: Queen(Pack of 2)
I really wanted to love these but they gave me a stiff neck. I haven't slept with a pillow since buying these. They are firm except where you lay your head. It just deflates there. I expected it to sink in to match the curve of my neck but it was more than I could handle. My head ended up in a valley between the two ends of the pillow. The price was good, zipper worked fine, it looks as advertised and the pillows are good quality. The cooling part works, its just not what I needed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
J
Verified Purchase
Jack Raines
Whiting, US
★★★★★ 5
best pillow I have ever bought.
Size: Queen(Pack of 2)
most comfortable pillow I have ever bought. It seems very well put together so I believe that it will last a long time. Very happy with the purchase. I do think the weight of the pillow will surprise many people because while it is quite heavy, it is very firm and extremely comfortable. Great value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
R
Verified Purchase
RC
San Leandro, US
★★★★★ 5
I paid for the product and it’s GOOD 👍🏽
Size: Queen(Pack of 2), Size: Queen(Pack of 2)
Honest review to help your decision. These are a bargain at two for one. I paid almost $30 for one at a local retailer and it’s already flattened after 7 months. This product arrives vacuum sealed with the cooling pillow covers separately (separate so you can wash before using). They are loaded with memory foam which I found pleasing. I chose to leave all of the foam in because I’m sure it’ll flatten sometime in the future. I’ve been using these for TWO MONTHS now and they have not flattened. Easy to mold and fluff, soft and they are added support for my back up pillows. I cannot attest to any type of pain relief because I have not experienced that with these personally. I do feel my sleep is better so my tension headaches have lessened. The cooling hex layer is on the cover NOT the actual pillows. I’m sure everyone knows that memory foam gets really hot 🥵 but the cooling covers on these help minimize that. It actually feels cool to the touch like a gel product. I find the quality to be exceptional. All in all, give it a shot.
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Reviewed in the United States on September 16, 2025
J
Verified Purchase
Jonathan Caballero
Massapequa, US
★★★★★ 3
More soft than firm
Size: Queen(Pack of 2)
Not firm but more soft, would I be returning probably not but if you were already on the fence this is your confirmation that it’s not as described, ( well to my standards at least ) it does feel of good quality but I was looking more a sturdy firm that soft and cushion feeling .
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Reviewed in the United States on January 1, 2026
S
Verified Purchase
StacyT
Belleville, US
★★★★★ 5
Best fluffy but firm pillows
Size: King(Pack of 2), Size: King(Pack of 2)
These pillows are worth every penny! They started off pretty flat but after three days they plumped up well. In addition to them being plump, they are also firm. Exactly what I was looking for. You can shake up the internal stuffing if you want them softer too. They were a bit pricey but I’m going to repurchase and replace all my home pillows with these. I do sleep hot and the cooling side is perfect to lay on. Kept me cool and comfortable. I haven’t had any neck or back pain after switching to these pillows too. Absolutely recommend these for your home. The photo shows how full the pillows are. I have four pillows in the picture plus two smaller other brands. These are definitely fluffier.
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Reviewed in the United States on January 8, 2026

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