i (my mechanic and acura service) am thoroughly flummoxed about what is wrong with the engine in my '96 integra with 60k miles that i bought used with 44k miles. i'll summarize:

1 crack in radiator top. radiator replaced with aftermarket radiator.
2 two months later, radiator leaking around teeth securing down the plastic top. mechanic diagnoses head gasket problem.
3 head gasket done and replacement radiator installed.
4 three months later radiator, leaking again, radiator replaced.
5 month later, radiator blows out, this time from the bottom.
6 mechanic replaces radiator, head gasket comes back with "no problem, just some very, very minor warping." mechanic takes a week to put engine back together. upgrades radiator cap and uses different aftermarket radiator.
7 200 miles later, leaking again from radiator. car taken to acura dealer who can find no discernable problem but acknowledges that there is "something wrong with this car". wants to remove water pump, etc and go on a fishing expedition.

the engine never overheats but there is a definite pressure problem. my neighbor suggests a crack at the bottom of the engine block and to use a sealing additive.

anybody have any ideas what is going on?