[fasttoyotapu]

A bunch of things could be causing your heart ache. For one, if that mecanic said "20%", he must have been doing a leak down test. That just tests for how much is leaking... if your engine has 20% on all 4 cyl. on a 4 cyl. engine, it should still run. that isn't the cause of your engine dying... As for your rebuild troubles... I am going to encourage you to go back to the person who rebuilt your engine and shove it up his a$%... it happens to me too and you have the right. I'm curious to see if he had your head machined and didn't add the head shim. the higher compression would cause detionation and your head gasket to blow. But of course this is a situation where i would have to open her up to see what the damage looks like and what would have cause the damage. Those trucks, when running right or repaired right, are bullet proof and worth every penny. So, my recommendation to you would be to get all your records together, the technician's story when you rebuilt the engine, and take it to a tech you trust or (even better) take it back to the one who screwed it up in the first place. Like I said, we won't know until we open her up.