Cometic, EST top end gasket kit. Twin Cam 4" bore - 99-17 110" Twin Cam (excl. Twin Cooled) (NU) 978588 Function must be programmed on

Function must be programmed on OEM speedometer in order to operate on the Drag Specialties speedometer

The self-adhesive mounting kits allow installation without welding

May require a load equalizer when used in conjunction with custom lighting

3-3/4" bore with

150" RCM (Rubber Coated Metal)

Cometic, EST top end gasket kit. Twin Cam 4" bore - 99-17 110" Twin Cam (excl. Twin Cooled) (NU) 978588 Function must be programmed onWith MLS (Multi Layer Steel) . 040" thick head gaskets. . 010" SLS (Single Layer Steel) cylinder base gaskets. . 020" SLS rocker cover gaskets. SLS gaskets have . 001" of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o ring for a complete top end rebuild. Note: Kit comes with 99 04 style valve seals and 99 10 style breather gaskets.