Stock Head W/ seats and guides 40mm Intake 35.5mm Exhaust Forged Springs: Single or dual high-rev

Springs: Single or dual high-rev springs

Pistons: Hypereutectic aluminum alloy Valve pocketcc:3cc

These are high-compression European-style pistons

They areready to install

Heads comes with Stainless Steel 42mm Intake and a Stainless Steel 36mm Exhaust Valves

Stock Head W/ seats and guides 40mm Intake 35.5mm Exhaust Forged Springs: Single or dual high-revAA 500 Series CastingWith seatsand guides40mm Intake 35. 5mm Exhaust, It is set up to build the performance Head of your needs. The 500Series Castings come STD with: Cleanflowingcooling vanes, formaximumcooling through the head, and around the intake ports forincreasedHP and over all cooling. Amodernized Combustionchamber, for increased head flow & performance. AsecondFull Fin, soyoucanFlycutyourheads deeper to achieve almost any desired Head CC