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Message: <blockquote data-quote="96blak54" data-source="post: 1454874" data-attributes="member: 14727">If it were me, i try bleeding the lashers first. While lashers are out, apply air pressure to each cylinder individually. Listen to air movement from intake, crankcase, and exhaust.If bleeding the lashers with some heat doesnt result in restored power, pulling the engine apart will be the only fix. What ive seen with messing around with all my junk parts are the pi head exhaust valves not sealing when seating. Meaning a valve job along with valve guides. You did mention replacing the valve seals which is a 100% clear indication of sloppy valve guides. And ford wasnt real strict on tight tolerance with npi and pi valve guides. The tolerance being on the upper end making the valve side load very sloppy.....killing valve seat seal and taking out the valve seals.Another is loose in cylinder carbon deposits sticking on the exhaust valve face keeping the valve from sealing on the seat. Its ever so tiny, but makes a huge difference to a 2000psi cylinder under compression. This in turn will beat a valve seat as well, killing valve seat face seal before the carbon finally moves on.All in all at the end of the conclusion.....a rebuild!</blockquote>