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Message: <blockquote data-quote="Stanimal" data-source="post: 1084160" data-attributes="member: 17869"><p>especially if you have gt40 heads, a b303 cam wont break springs. something else happened, and you should find out what before you make plans of rebuilding so you know what to fix, be it a mechanical problem, or driver error. the 2 most used cams are b303 and e303. the b303 has a little more duration then the e303, but the b303 has a lot less lift then the e303. in the end, it could just be metal fatigue and nothing is actually wrong at all other then age and wear.</p></blockquote><p></p>