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Message: <blockquote data-quote="5-oh-MUSTANG" data-source="post: 1447270" data-attributes="member: 17352"><p>Ok well I did the test where you block the pcv valve and check for any vacuum at the oil filler and didnt have any, so the lower intake gasket should in theory be fine. I do not want to take off the lower intake manifold again if I do not have to. So this probably means my valves are miss adjusted which i had a feeling of because when I crank over the motor it doesnt sound right either. Anyways, I just unbolted the driver side valve cover and roller rockers. Let the lifters sit for couple minutes. If i push down on my pushrods through the guideplates i cannot seem to compress the lifter spring? Is there not supposed to be spring tension on the lifter as i push down on it, hence when setting the preload it goes down? I just tried to adjust them again by turning the engine over by hand until cylinder 5 exhaust valve was opening, i adjusted that cylinders intake valve. Then when intake opened and started to close I adjusted that cylinders exhaust valve. I moved the pushrod up and down till they stopped jiggling/no up down movement and then gave the nut a half turn from that point. I repeated this for cylinders 5-8 and by the time i was done and turned the motor over by hand a few times again all the pushrods I had just adjusted had a bit of slack in them again and were a bit loose? So are my lifters a problem or is this side of the motor safe to say is set or did I do this all wrong again??!!</p></blockquote><p></p>