Manley Exhaust 33mm Stainless Race Master Valves Subaru WRX EJ205 / STI EJ257 2002-2021 LegacyGT_2010-2012 a thin layer of oil

a thin layer of oil lubricates the connection between the bearings and the crank allowing the crank to "float" and reduce wear

Recommended for built or performance-oriented engines

which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treating (a very common industry practice)

Throw-out Bearing (when applicable)

Manley Exhaust 33mm Stainless Race Master Valves Subaru WRX EJ205 / STI EJ257 2002-2021 LegacyGT_2010-2012 a thin layer of oilPart #: 11171 8 Notes: Race Series Valves; Exhaust; Set of 8 Margin: . 060" O A Length: 104. 75mm Underhead Angle Radius: 25 x 11 32" Stem Diameter: 6. 0mm . 2362" Tip Length: 3. 5mm Head Diameter: 33mm Seat Width: . 080" Top of Head: 20 Dish