yeah this isnt the first time someone has tightened down high ratio rockers without letting the lifter bleed down...most of the time it just kill sthe valve seal and you get oil burning.

on those instances where the piston is at tdc....you can open the valve right into the piston...as if you had .7 valve lift.

even oem rockers could do this.

do a leakdown test, compression test might not be very helpfull.

just use the spark plug portion of the hose and blow into it with it at tdc compression