Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Gaskets and Seals› Engine Gaskets and Seals
Cometic Gasket
Cometic GM LS Gen-3/4 Small Block V8 .120in MLS Cylinder Head Gasket - 4.100in Bore
SKU: C006 C5489-120
Easy — 1–2 hours
Overview
The gasket is constructed with multiple embossed layers of stainless steel, and its outer layers are coated with a Viton rubber material for enhanced sealing and heat resistance. This design provides maximum sealing performance for high-output engines and does not require sealants. MLS gaskets are suitable for both aluminum-to-aluminum and aluminum-to-cast iron block configurations.
Show original supplier description
Part #: C5489-120
Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0.120". 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.
GM LS1/LS2/LS3/LS6 Gen-3/4 Small Block V8 .120in. MLS Cylinder Head Gasket | 4.100in. Bore
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Engine overheating after short drive
- White smoke from exhaust on startup
- Rapid coolant loss with no visible leaks
- Rough idle and misfire under load
- Milky oil on dipstick or oil cap
Diagnostic Codes
- P0300 – Random or multiple cylinder misfire Det
- P0301 – Cylinder 1 misfire Det
- P0302 – Cylinder 2 misfire Det
- P0303 – Cylinder 3 misfire Det
- P0304 – Cylinder 4 misfire Det
- P0128 – Coolant Thermostat Temp Below Regulating Temp
- P0217 – Engine Coolant Overtemperature Condition
- P0171 – FT Malf (B1)
- P0174 – FT Malf (B2)
Relevant Conversations
- LS3 head gasket failure symptoms white smoke
- Cometic C5489-120 4.100 bore 0.120 thick MLS head gasket
- blown head gasket LS1 rough idle P0300
- best head gasket for boosted LS build
- Cometic vs Fel-Pro LS head gasket comparison
- LS head gasket replacement cost and time
- how to install MLS head gasket LS engine
- coolant in oil LS engine diagnosis
- P0128 after head gasket replacement LS
- LS head gasket torque specs Cometic C5489-120
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Cometic Gasket |
| Part Number | C006 C5489-120 |
Videos
Cometic MLS Head Gaskets
Reviewing Cometic's MLX Head Gaskets
Product Review: EBay LS1 LQ4 6.0 6.2 cylinder head gaskets vs Mahle OEM Gaskets
Cometic Gaskets presented by J&P Cycles.
Reusing MLS headgaskets
Understanding MLS Head Gaskets
Inside Fel-Pro PermaTorque MLS Head Gaskets
SEMA 2016: Cometic Gaskets at the Forefront of Gasket Technology
Cometic Gasket failure
SCE Gaskets discusses the NEW MLS GS Gasket and Vulcan Cut Ring Head Gaskets
About MOTORMIA
Buy with Confidence
Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return PolicyShipping
Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
View Full Shipping Policy