i did check the thing pretty thorough before i put it on. what i might try is adding a 50/50 mix of water and draino or some solvent that might dissolve this stuff without damaging the paint metal or the copper radiator. ill test it out by setting some of the sludge i harvested in it and see if it dissolves it. ill also set some on the valve cover to see if itll hurt the paint and set some on a old copper plate i have. ive also removed the thermostat because its florida and it was also completely plugged with the stuff. im sure ill find something. it seems like a artificial fiber and while im at it im gonna clean the whole cooling system because when it got rebuilt for some reason it got extremely dirty in the system and theres a crapload of what i think was old rust and alot of machine oil to keep the head from rusting (the inside of it wasnt painted). i also read up that in the heads of these 235's there is these water jets or something of that nature that pass water up through the head. is this true and if so ill have to flush the cooling system backwards because theyd be clogged.
