i put 100 miles on my 66 toro ran good,a week later i went to start it and it sounded funing turnig over when it started it has a loud rattle deep in the motor and and white spoke was comeing out left pipe looked in radiator saw bubbles,so i figured bad head gasket,i jack up the car with motor running got under oilpan thats were the noise is comming from ,not a steady rap but a fluxuating loud raddleing noise ,the motor idles nice, no misses when i rev it up noise gos away ,after 10 min. motor stops making noise.no water in oil,cant figurer why i have two things go bad at same time or if they or related ,thanks mark