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Message: <blockquote data-quote="milo" data-source="post: 1331430" data-attributes="member: 16489"><p>i got my car checked today. and i found out the reason for the noise in my car. because i was using metal gasket and i skim the engine head, the piston hits the cylinder head when it reach its maximum height. note: not valve, it is the cylinder head. i found out that 4g91 cylinder head, the valve area is not a round shape. it is more like a circle cut into two, then seperate them, and use two stragiht lines to connect them. therefore when u increase ur compression, the piston hits the straight line area cos that area is flat and not dented inside. i change to thicker gasket, made of carbon. now no sound already. cos the piston won be hitting the head any more. power lost a bit due to the decrease in compression. hope this can help u. i think u should takeout the head and check. or find ur mach la i think he can differentiate the noise of the tapet and other sounds. better go fix it before bigger problems occurs</p></blockquote><p></p>

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