Cast iron is great when it comes to maximum durability and wear resistance. It is perfect for long distance touring applications. It is the standard since the invention of the piston engine. Note: Standard non-oversize dimensions (for reference only) are 0.6440" O.D. (16.37mm); 1.050" I.D. (26.67mm); 1.900" OAL (48.26mm).

C630 bearing bronze is a tough nickel-aluminum-bronze alloy. It is not as durable as cast iron but typically used in high performance and racing applications where rapid heat transfer from the valve to head is important. Note: Standard non-oversize dimensions (for reference only) are 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm).

C630 bearing bronze is a tough nickel-aluminum-bronze alloy. It is not as durable as cast iron but typically used in high performance and racing applications where rapid heat transfer from the valve to head is important. Note: Standard non-oversize dimensions (for reference only) are 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm).

Cast Iron is great when it comes to maximum durability and wear resistance. It is perfect for long distance touring applications. It is the standard since the invention of the piston engine. Note: Standard non-oversize dimensions (for reference only) are 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm).

Cast Iron is great when it comes to maximum durability and wear resistance. It is perfect for long distance touring applications. It is the standard since the invention of the piston engine. Note: Standard non-oversize dimensions (for reference only) are 0.5620" O.D. (14.27mm); 0.3090" I.D. (7.85mm); 2.00" OAL (50.8mm). 524313

Cast iron offers maximum durability and wear resistance for long distance touring. The standard since the invention of the piston engine. Note: Standard non-oversize dimensions (for reference only) are 0.5647" O.D. (14.34mm); 0.3395" I.D. (8.62mm); 2.800" OAL (71.12mm).

Cast iron offers maximum durability and wear resistance for long distance touring. The standard since the invention of the piston engine. Note: Standard non-oversize dimensions (for reference only) are 0.5952" O.D. (15.12mm); 0.3715" I.D. (9.44mm); 3.135" OAL (79.63mm).