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The heater hoses on a 305 engine run from the intake manifold to the heater core and the heater core to the radiator. This creates a constant source of heat to supply the heater.
The intake valve is bigger.
The heater hoses connect the block, radiator, heater core, and waterpump. To replace, drain the radiator and catch the anti-freeze for recycling. Remove the hoses and put on new hoses. It is kind of nasty but not very difficult.
valve cover with a vaccum hose going to the throttle body
It is in the valve cover.
15,000/305=49.1 hours.
the bypass connector is located on the engine wire harness, next to the left valve cover (watching engine front) next to the air injection control valve.
it depends if you have a 305 or 305ho , 305 8:1 compression cupped cylinders 305ho has 9:1 compression with valve cut pistons
Yes, but I don't know why you would want to use them on a 350. 305's are limited as far as valve size is concerned because their small bore causes clearance problems with the large valve heads... Larger valves will actually hit the block on a 305. Just about ANY 350 head is better than ANY 305 heads.
usually caused by a leaking heater core.
Yes, You can put a manual shift valve body in it.
Follow the recommendations from the cam manufacturer.