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    Compression varies between cylinders on new engine?

    I am re-building a 5.9 magnum gas. Have built engines before and never ran across this. The engine won't start. A compression check of all cylinders varies between 75 and 170. Engine was bored .030 by a NAPA shop. New flat top .030 pistons & rings installed. The decks are level. Cylinder heads...
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