Im having a problem with my 67 F-100 with a 352. I replaced the drivers side exhaust manifold gasket, and intake gaskets. After everything was back together I started it up and I noticed the water was mixing in the oil. I did a compression check and all cylinders were good except number 4 which, was full of water and compression around 50 psi or so. So I replaced the intake gaskets again just in case it was damaged, got every thing back together and the water is still mixing. Ive had this truck for years and it ran fine before all this. I dont know what to else to do other than replace the headgasket which I dont think is the problem. Any one have other ideas?