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I have gas ported big chief J & E pistons. Can you get an accurate reading on a cylinder when you are checking them doing a leak down? I have a problem with all my cylinders leaking at 40 to 50% hot or cold. I have only three runs on my engine.
 

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Still seems like way too much leakage. With that amount of leakage, you should be able to hear where the leak is coming from (intake manifold, exhaust pipe, crankcase vent, etc).
 

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Still seems like way too much leakage. With that amount of leakage, you should be able to hear where the leak is coming from (intake manifold, exhaust pipe, crankcase vent, etc).
Thats what I am thinking, if its that bad you should hear it going somewhere...
 

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I have gas ported big chief J & E pistons. Can you get an accurate reading on a cylinder when you are checking them doing a leak down? I have a problem with all my cylinders leaking at 40 to 50% hot or cold. I have only three runs on my engine.
Ive personally watched a SBC leakdown like 3% BEFORE it was taken off the engine stand!
 

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At 3 runs is it possible the rings are not 100% seated yet?
Not a chance. After one pull, it will pretty well leak what it is going to leak. Three runs with nitrous, well thats much more cylinder pressure, so rings will seat even quicker. BG
 
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