>>> EPIC FAIL on the pressure test! <<< (i.e. do NOT put muffler tape in your roadside repair kit)
Despite filing down the jagged edges of the 1/4" (actually 3/8") tee until flush with the main 5/8" bore,
Despite leaving the custom-trimmed Tiger Patch out in the hot sun for 15 minutes (hey, it's 1,900degF MUFFLER tape),
Despite TIGHTLY wrapping it with at least 8 laps, each turn thumb-jammed into the gaping maw,
Despite letting it "set up" for 10 hours before stressing it...
... it performed like a piece of plywood held 3 feet from an open fire hydrant...
(i.e. it now bleeds straight down, instead of all over the engine bay...)
PS: It appears the heater hoses are flowing even with t-stat CLOSED, amirite?