These are M20 Ireland Engineering heavy-duty cast rocker arms. We designed them to be extra thick on the adjuster side to eliminate the fatigue failures which are common with factory rockers. They are polished and shot peened with very few casting marks. Use standard BMW adjuster hardware. Order 12 for a complete set.
These are a good idea for any engine rebuild; stock, performance, or race. We use these on our own race engines with great success.