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Message: <blockquote data-quote="94Snake" data-source="post: 554006" data-attributes="member: 8739"><p>you don't actually need a leakdown tester to test the cylinders for this, but you do need access to a compressor of some sort, nothing big, and only about 20 psi in the lines. install your compression test set like you normally would except pull the valve stem (like in a tire) out of the of the rubber tube on the end that threads into the spark plug adapter. it will allow air out of the cylinder but not back into it if it remains installed. make sure your car is in neutral, remove the radiator cap and make sure that both the intake valve and exhaust valve are closed on the cylinder your testing and plug the compressor directly into the rubber tube. the cylinder will fill with air and if your head gasket is busted near a water jacket, bubbles will begin to rise in the radiator. also you can listen intake tube and your exhaust to see if your valves are leaking too, if you hear air going into the oil pan that's normal unless it really seems like an excessive amount when compared to the other 7 cylinders. hopefully this makes sense for you, also one more thing, since your intake is now milled, wouldn't that throw off the alignment of the intake to heads slightly? Because now the inake will sit slightly lower than it used to. Just wondering.</p></blockquote><p></p>