The Cometic C9790 is a multi-layer steel (MLS) cylinder head gasket set designed for 1999–2013 Harley-Davidson 88ci and 96ci Twin Cam engines.

It features a 3.750-inch stock bore size and a compressed thickness of 0.030 inches, sold as a pair.

Replacement Part for OEM Number(s) 1677599

Key Specifications
Application: Harley-Davidson Twin Cam 88"/96" (1999–2013)
Bore Size: 3.750 inches
Compressed Thickness: 0.030 inches
Material Type: Multi-Layer Steel (MLS) with Viton coating
Quantity: Sold as a pair

Design Features
MLS Construction: Composed of outer Viton-coated embossed spring steel layers with a central support layer to handle extreme combustion pressures.
Load Control Embossments: Promotes an even torque load across the mating surface to minimize bore distortion.
Reusability and Reliability: Resists blowouts, requires no retorquing once properly installed, and functions effectively under high heat and varying surface finishes.

2013 Harley-Davidson FXSB Breakout
2012-2013 Harley-Davidson FLS Softail Slim
2011-2013 Harley-Davidson FLTRX Road Glide Custom
2011-2013 Harley-Davidson FXS Blackline
2010-2013 Harley-Davidson FLSTFB Fat Boy Lo
2010-2011 Harley-Davidson FLHTK Electra Glide Ultra Limited
2008-2013 Harley-Davidson FXDF Fat Bob
2008-2011 Harley-Davidson FLSTSB Cross Bones
2008-2011 Harley-Davidson FXCWC Rocker C
2008-2009 Harley-Davidson FXCW Rocker
2007-2013 Harley-Davidson FLHTCU Electra Glide Ultra Classic
2007-2010 Harley-Davidson FXSTC Softail Custom
2006-2013 Harley-Davidson FXDB Street Bob
2006-2013 Harley-Davidson FLHX Street Glide
2006 Harley-Davidson FXDI35 Dyna 35th Anniversary Super Glide
2006 Harley-Davidson FLSTI Heritage Softail
2006 Harley-Davidson FLHXI Street Glide
2006 Harley-Davidson FLST Heritage Softail
2005-2013 Harley-Davidson FLSTN Softail Deluxe
2005-2007 Harley-Davidson FLSTSC Softail Springer Classic
2005-2006 Harley-Davidson FLSTSCI Softail Springer Classic
2005-2006 Harley-Davidson FXDCI Super Glide Custom
2005-2006 Harley-Davidson FLSTNI Softail Deluxe
2005 , 2007-2013 Harley-Davidson FXDC Super Glide Custom
2005 Harley-Davidson 15th Anniversary Fat Boy FLSTF
2004-2007 Harley-Davidson FLHRS Road King Custom
2004-2006 Harley-Davidson FXDWGI Dyna Wide Glide
2004-2006 Harley-Davidson FXDI Dyna Super Glide
2004-2006 Harley-Davidson FLHRSI Road King Custom
2004-2005 Harley-Davidson FXDXI Dyna Super Glide Sport
2003-2006 Harley-Davidson FLHTI Electra Glide Standard
2002-2006 Harley-Davidson FLHTCI Electra Glide Classic
2002-2006 Harley-Davidson FLSTFI Fat Boy
2001-2006 Harley-Davidson FLSTCI Heritage Softail Classic
2001-2006 Harley-Davidson FXSTDI Softail Deuce
2001-2006 Harley-Davidson FXSTI Softail Standard
2001-2006 Harley-Davidson FXSTBI Night Train
2001-2006 Harley-Davidson FXSTSI Springer Softail
2001-2003 Harley-Davidson FLSTSI Heritage Springer
2000-2013 Harley-Davidson FLSTC Heritage Softail Classic
2000-2013 Harley-Davidson FLSTF Fat Boy
2000-2009 Harley-Davidson FXSTB Night Train
2000-2007 Harley-Davidson FXST Softail Standard
2000-2007 Harley-Davidson FXSTD Softail Deuce
2000-2006 Harley-Davidson FXSTS Springer Softail
2000-2003 Harley-Davidson FLSTS Heritage Springer
2000-2001 Harley-Davidson FLHRI Road King
1999-2013 Harley-Davidson FLHR Road King
1999-2006 Harley-Davidson FLHT Electra Glide Standard
1999-2006 Harley-Davidson FLHRCI Road King Classic
1999-2006 Harley-Davidson FLTRI Road Glide
1999-2005 , 2007-2013 Harley-Davidson FLHTC Electra Glide Classic
1999-2005 , 2007-2010 Harley-Davidson FXD Dyna Super Glide
1999-2005 , 2007-2009 Harley-Davidson FXDL Dyna Low Rider
1999-2005 , 2007-2008 , 2010-2013 Harley-Davidson FXDWG Dyna Wide Glide
1999-2005 Harley-Davidson FXDX Dyna Super Glide Sport
1999-2002 , 2007-2010 Harley-Davidson FLTR Road Glide
1999-2000 Harley-Davidson FXDS-Conv Dyna Convertible
1999 Harley-Davidson Road King EFI FLHR
1999 Harley-Davidson Electra Glide Ultra Classic FLHTCU