my friend has shown pics of his exhaust cam that has snapped. it seems to have snapped between at valves 2 and 3. the cam cap jas also snapped in half. has anyone experienced this or know what might have caused it. tomei 272 10.8. supertec springs and retainers. help shedding light into possible causes would be appreciated. std cam cap bolts. i am waiti.g for cylinder head to see more detail.