Valve Exh; BT'99-04 Hi-Flow

* One piece forged racing grade stainless steel alloy.

* hard black nitride finish.

* bearing quality hardened tip at the end of the stem to prevent premature wear with high-lift applications.

* 45o angle below the lock groove to facilitate the valve seal installation.

* Heat treated with a special process.

* stem is centerless ground for longer life.

Head Dia = 1.570in.

OAL = 4.525in.

Stem Dia = 0.3106in.