PRODUCT DETAILS
Cometic 73.5mm .024" MLS Head Gasket - 2017-2021 Honda Civic Si (L15B7) (C14019-024)
If you're pushing more boost out of your L15B7, or you just want a head gasket that can actually handle what this little turbo motor can do, this is the one to run. Cometic's 73.5mm, .024 inch MLS gasket is built for exactly this engine, and it's the gasket most people land on when they're done trusting the factory piece to keep up. It's made from multiple layers of stainless steel instead of the composite material Honda uses, so it seals better, handles more heat, and doesn't get brittle and start leaking the way a stock gasket can once you're running real boost.
Here's Why Your Stock Gasket Struggles Under Boost
The factory gasket on the L15B7 is fine for stock power, but it's not built with much room to spare. Add more boost, run it harder, or just put a lot of miles on a turbo motor, and that factory gasket can start to fail. You'll see it as a coolant leak you can't find, white smoke out the tailpipe, coolant mixing into the oil, or a car that overheats for no obvious reason. Once that happens, you're not just buying a gasket, you're often looking at a warped head too. Swapping to an MLS gasket before that happens, especially if you've already turned up the boost, is cheap insurance against a much bigger repair down the road.
Multiple Layers Of Stainless Steel, Built To Take The Heat
This gasket is built from several layers of stainless steel stacked together, which gives it the strength and rebound a single-layer gasket can't match, plus real resistance to corrosion over time. The outer layers are embossed and coated with Viton, a rubber coating that handles heat up to 482°F, so it keeps sealing through hard heat cycles instead of hardening and losing its seal. Because it's MLS, it's built for exactly what you've got under the hood, an aluminum head clamping down on an aluminum block, and it handles the shearing forces between those two metals without any extra sealant. You don't add anything, you just install it and it does its job.
No Re-Torque, One Less Thing To Remember
Cometic tunes the embossing pattern on this gasket so the clamp load spreads evenly across the whole sealing surface the moment you torque it down. That means no coming back in a few hundred miles to re-torque the head bolts like some gaskets call for, and less risk of warping the head from uneven clamping. You torque it to spec once, and it's done. If you're already in there doing head work, installing studs, or chasing a leak, that's one less step to track and one less thing that can go wrong later.
Get The Right Thickness
This is the 73.5mm bore, .024 inch thick version, and that thickness matters. It's built to match the L15B7's stock bore and deck height, so it's the right call if you're replacing a blown stock gasket or doing a head gasket job at stock compression. If you're milling the head, running a different piston setup, or chasing a specific compression ratio, Cometic makes this gasket in other thicknesses too, so make sure the one you order matches your actual build, not just your engine code. Order the wrong thickness and it won't seal right no matter how well you torque it down.
Fits The 2017-2021 Civic Si
This gasket is built for the L15B7 in the 2017-2021 Honda Civic Si. If you're already pulling the head for a gasket job on a turbo car, it's worth thinking about head studs at the same time, stock head bolts stretch under higher boost, and studs give you more consistent clamping for the long haul. Pair the two and you've got a head gasket setup that can handle a lot more than stock without worrying about it again.
What You Get
- Cometic MLS head gasket (C14019-024) for the Honda L15B7
- 73.5mm bore, .024 inch compressed thickness
- Multiple layers of stainless steel for strength and corrosion resistance
- Viton coating on outer layers, heat resistant to 482°F
- Even clamp load embossing, no re-torque needed after install
- Built for aluminum head to aluminum block applications
- No additional sealant required
Fits These Cars
- 2017-2021 Honda Civic Si (L15B7)
Note: Cometic MLS head gasket (part number C14019-024) for the Honda L15B7, 73.5mm bore, .024 inch compressed thickness, for the 2017-2021 Honda Civic Si. Built from multiple layers of stainless steel with outer layers embossed and coated in Viton, heat resistant to 482°F, for strength, corrosion resistance, and a seal that holds through repeated heat cycles. Designed for aluminum head to aluminum block applications and requires no additional sealant. The embossing design distributes clamp load evenly across the sealing surface, so no re-torque is needed after installation. Bore and thickness are specific to this engine's stock configuration, confirm your build matches before ordering if you've milled the head or changed compression. One head gasket per order.