Well, that's the normal flow path into the block from the bottom and out the top, but still a good idea. Removing the thermostat helps a lot also. Basically the more flow from either end will help dislodge crap. If the engine has had the two block drain plugs replaced recently, removing them and sticking a probe in the hole if necessary to get a clean flow of water will remove a bunch of sediment since the drain holes are basically on the bottom of the coolant area on each side of the block. Reason I said "recently" is we always remove them before sending bare blocks off to be cleaned and it's surprising how many times the plugs have never been removed even when there is evidence the block had been had been worked on before. Original plugs were metal that corrodes away over time and a few have broken off flush when attempting to remove them - and not something you want to get into when just going for a simple flush.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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