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Message: <blockquote data-quote="96blak54" data-source="post: 1532761" data-attributes="member: 14727">Im a little confused. The intake manifold question has me thrown off, but yes i agree with baddass98svt your equipment and components must be repeatable to be confident in the results.Anyhow, take the lowest reading cylinders piston to the bottom and squirt(squirt is key word, you want oil on the cylinder walls) some oil into the cylinder, rotate the crank a few times to cycle the piston and then do a compression test. If the psi comes up strong, its the rings/bore relationship. If the reading remains relatively the same its the valves leaking. Could be a combination of both also. Its not uncommon for modular valves not to seal up when seated especially pi heads. Its theorized that the valve seats spin a few times before actually taking a seat, therefore reducing sealing valve to seat. Most modular heads that ive torn down show this alot on the exhaust seats.</blockquote>