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Tech & Fab
2007 ls3 valvetrain noise
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<blockquote data-quote="cash talks" data-source="post: 164623" data-attributes="member: 32"><p>bought an 07 half ton crew 4x4 yesterday with 125K. its throwing a PO304 Cylinder 4 misfire code. it has a horrible knock noise coming from the head/ valvecover. increases with rpm. 89%sure its not bottom end. holds 45psi of oil pressure at stop signs. gonna open it up this weekend. couldnt find any help on several sites. accepting guesses on what it is. it has no vibration/ balance issues like you would think. lucky one wins a special prize. i figured i would just put a low mileage motor in it but gonna open it up first. guy i bought it from said the chevy dealer told him it was a lifter and its common. if it was common it would be ALL over the web. besides, how do you know its a lifter without opening it up. would like it to be something simple and cheap and i will throw in a cam and springs while im in there.</p></blockquote><p></p>
[QUOTE="cash talks, post: 164623, member: 32"] bought an 07 half ton crew 4x4 yesterday with 125K. its throwing a PO304 Cylinder 4 misfire code. it has a horrible knock noise coming from the head/ valvecover. increases with rpm. 89%sure its not bottom end. holds 45psi of oil pressure at stop signs. gonna open it up this weekend. couldnt find any help on several sites. accepting guesses on what it is. it has no vibration/ balance issues like you would think. lucky one wins a special prize. i figured i would just put a low mileage motor in it but gonna open it up first. guy i bought it from said the chevy dealer told him it was a lifter and its common. if it was common it would be ALL over the web. besides, how do you know its a lifter without opening it up. would like it to be something simple and cheap and i will throw in a cam and springs while im in there. [/QUOTE]
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