I just had the dreaded Head Gasket problem. I tried a product called THERMOGASKET and it seems to be working. I do not like that I have to leave thier bleeder valve on the car from now on. Anyways I was getting fluid leaking out of the surge tank cap so I called them up and they said I should go to NAPA and get a 20lb cap. Well they do not have and have no idea where to get one. Any ideas where and if so a part number. Thanks Sal