oil and water don't seem to mix well. How can I stop it?

[Guest zblue240]

I was checking the oil on my 71 240Z today and found a nice foamy mess on my dipstick. Yipee. I pulled off the head to replace the gasket and couldn't find a breach anywhere. There is no water in the cylinders though. Are there any other weak points that could let water through into the crankcase? Does the head need to be stripped to do a pressure test? Any way to check the block for cracks without tearing it out? Thanks for any help...Ryan

[A. G. Olphart]

Can't answer your questions, but how long had it been since you last checked the oil? If the crankcase ventilation systm/PCV valve plugs, your oil will end up with water in it over time from combustion products/blow by.

[Guest Aaron]

Intake manifold or gasket?