M30 Rocker Arm Lock Set

On factory M30 cylinder heads, the rockers are held in position by a spring. At high RPMs, that spring can allow the rocker to move relative to the valve stem — sometimes enough to walk off entirely — which quickly results in a broken rocker arm.

Rocker arm locks eliminate the spring and positively locate the rocker arm. They also make head assembly simpler than working with thrust springs. We use these on all of our performance engines and cylinder heads.

• Fits: all BMW M30 engines
• Set of 12