[dsraven]

some systems will overheat if the bypass hose is removed but you can try plugging and go from there. a cut off piece of broom handle and some hose clamps would be good enough to plug the hoses for a test. then if it doesn't overheat use the rubber plugs like mentioned in an earlier post. sometimes the manifold fittings are very tight and it becomes more trouble than it's worth to get them out plus the possibility of cracking the manifold like mentioned.