We are currently in the process of relocating and building out our new shop. Our online store is still open for business and accepting orders but delivery may be delayed up to 4 weeks. We apologize for any inconvenience this may cause. We truly appreciate your business and your support! We will be monitoring emails and voice messages on a regular basis and will respond as quickly as possible. Thank you!
On factory M10 cylinder heads, the rockers are held in position by a spring. At high RPM’s, that spring may allow the rocker to move in relation to the valve stem (sometimes enough to walk off the valve stem) which quickly results in a broken rocker arm. With rocker arm locks, you eliminate the spring and positively locate the rocker arm. Locks also make head assembly simpler than with thrust springs. We use these on all of our performance engines and cylinder heads.
