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Appreciate the help guys. One person was worried valve guides bad and dropping valve since don't recall last time these heads freshened

Knew was more info needed. Yes cold and yes TDC. Tried hearing and once thought heard the big exhaust tube low note on right side and another time guy on other side said he thought heard thru...

What's acceptable leak down per cylinder on 23 degree 406 sbc 12.5:1 compression. Going thru some oil and breathers not covered. Checked all 8 and ranged from 10% lowest to 28% highest on couple...