C630 Bearing Bronze is a tough nickel-aluminum-bronze alloy typically used in racing and high-performance applications where rapid heat transfer from the valve to the head is important.
Note: Standard non-oversized dimensions (for reference only) are 0.4750″ OD (12.07 mm); 0.2347″ ID (5.96 mm); Overall Length 1.655″ (42.04 mm).
Fits:> 17-21 M8
