The waterfall sound is likely coming from the flow to/from the heater core.

 

thats what i figured but i've done the heater on full blast and did my best to burp system and i still hear it but it's not constant,what i don't understand is why you don't hear it when standing still,thanks

 

Sometimes air can be very difficult to get out.
I would run it hard and try bleeding the air out again.

 

will do,just don't want system to overpressurize,if i run it hard then let it sit and then just crack exp cap to release pressure would that do it?

 

I think it would blow out the gasket sealer you put on the rear of the head (s) before the coolant tank. Your old tank likely blew from age. Apparently it's common that they crack. Given the under hood heat they endure, it's not suprising.

 

then won't be doing that!thanks,wouldn't want to make a fatal mistake after all i've done

 

Swap your heater core hoses if you want a quick way to burp the heater. Worked like a charm on mine.

 

when you say swap do you mean putting new ones in or disconnecting from top and reverse flushing?cause pulling those can't be fun

 

Switch the hoses top and bottom and reverse flush.

I ran mine like this for a few days then switched them back to the original setup, then bleed as necessary from the radiator fill plug.

 

this should be a new thread but i have to ask,do you mean taking the hoses on passenger side valve cover and criss cross them,i'm a little confused,if you have pics sure would appreciate