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4d EG manual rack/trans low n slow
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Vacuum line going to the intake pipe or manifold? If you have a large free flow intake pipe maybe you're not achieving enough vacuum, I know my skunk manifold has extra ports, and post throttle body is higher vacuum.
I'd put a little Marvel's mystery oil or a little ATF (1/8 oz) on top of the pistons and spin it without plugs in, see if you have sticking rings
 

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4d EG manual rack/trans low n slow
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224 Posts
Well, obviously you're leaking pressure, if it's not a seal or ring(s), then you have a fail in metallurgy.
Does it blow air when the engine is cold and hot? Does it get lower or higher intensity when the engine warms to temp?
What is the static compression ratio? I'd say if you're getting 250 psi, and the gauge is accurate, You're over pressure rating for seals or the ring end gap is incorrect.
*DrTalons post is a good way to test.
 
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