Re: Heater hosereplacement on a 67 Camaro
In an open system, the coolant will try to reach a level even with the lowest point open to the atmosphere. So, if the level in the radiator is higher than the lowest point you will be opening up, then you will be discharging from that lower point.
In other words, because the heater hose nipples on the intake and water pump are lower than the level in the radiator (assuming you have it filled within 2 or 3 inches of the top of the rad, as recommended for an open system), you will get coolant gushing from both of those when the heater hose is removed.
If you drain the level in the rad down below the lowest point, then no gush. So, you do not need to drain completely, but at least some.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!