Cometic MLX Head Gasket for Porsche 996 & 997.1 turbo 102mm

What size are these?

The Cometic MLX Head Gasket for Porsche 996 & 997.1 turbo are for 102mm up to 103.5mm bore sizes.

These are 0.040″ thick MLX style gaskets to slightly lower the compression ratio in higher boost applications.

What is MLX vs. MLS?

MLX is an upgraded version of the MLS.  It uses an internal O-ring style crush ring close to the inner bore of the gasket.  This raises the pressure on the gasket where it’s needed the most.  It’s not a replacement for o-ringing heads, but definitely an improvement over the standard MLS.   The reason they’re 0.040″ and up in thickness is to accomodate the extra o-ring and wrap around of the inner sealing surface which better protects the gasket at high power levels

Why can’t I use OEM head gaskets?

If you’re building your engine for high power you want to use the best head gaskets available. Cometic has made a tremendous name in racing and high powered street engines with their MLS and MLX Head gaskets.

If you’ve put in big head studs, you’ll be needing these.  OEM head gaskets are about impossible to drill out and oversize.  Save shop time and excessive labor by purchasing the correct head gaskets for your build.

Can I use these on a stock engine without big head studs?

Absolutely!   Even with a stock engine build, these head gaskets are a nice upgrade for improved sealing over oem head gaskets.

how many do I need?

These are priced individually, so you’ll need 2 if you’re doing a full build, or only 1 if you’re doing a single bank repair.

Need help with your build?

Check out Protomotive Engine building and Protomotive consulting service.