Standard timing chains can stretch and wear under high load, with a consequent affect on engine performance. German made Iwis competition timing chains are specially made with high wear resistant materials and coatings for longer life and improved performance. If you are building a competition Alfa twin-cam engine, then fit the best chains you can get! 

See item code EN560 for the bottom timing chain, EN561 for a 1300 engine top timing chain and EN562 for a 1600 Top timing chain.