How do I tell if I have a warped head?

Compression test!!!!

if the head gasket is blown... you will either "A", have water in the oil. "B" Water in the exaust. or "C" Hydro-lock, meaning the cylinder is filled with water, with the valves close, and so it will not crank over. Or "D" water sprays all over, outside the engine. To fix hydro-lock..... remove spark plugs... start engine.... if it turns over....your gasket is blown. To know if water is in oil..... look at the threads of the 710 cap, if it has a white foamy build-up.... you have gasket issues. Exaust.... drill a small hole in muffler at bottom, near front side..... if water drains like mad... nothing to do with the gasket :) BUT!!!!! if it smells like anti-freeze...well your looking at one heck of a lesson on engines. P.S. as far as the water thing goes... if its alot of water draining, always from your exaust.... you may need a new cat converter....its very clogged. to solve clogging cats, change air filter MORE often. every 6 months.