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Think I found the problem. #4 intake rocker is broken! Not sure why yet. These are a used set of Norris 1.7s.

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Blowers create boost as you know, but also put a incredible strain on the rockers, push rods and lifters, a lot of strain. So you need a good valve train, I have no idea about your rockers?

The broken rocker is not the reason for 40% leakage, I'm betting the rings didn't seat during break in usually because of the wrong fuel mixture during break in.

Good luck with it, did you build it?