The hole in the thermostat really only affects how hard it is to fill the system Without the hole there isn't a good path for the air in the radiator to escape. The block isn't a problem since air can escape via the bleed screw. Once the thermostat partially opens the hole doesn't really do anything.
But you can "cheat". If you disconnect the small hose that goes to the top of the radiator when filling and initially cold bleeding air in the radiator has an easy escape path.
If by that you mean that each time you check for air after driving you are seeing a significant release of air, either you didn't do the initial bleed properly or there is a small head gasket leak that is pumping air into the cooling system.
But you can "cheat". If you disconnect the small hose that goes to the top of the radiator when filling and initially cold bleeding air in the radiator has an easy escape path.
Originally posted by uuc328
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