It sounds like you got anti freeze in the oil. If you hear a tapping in the bottom of the engine your going to spin a bearing. Sounds like the new engine had a bad gasket.
Ok quick question for you guys. I have had this blazer since it was
> brand new. The oil pressure at idle was usually around 40 after it
> warmed up, slightly higher under acceleration. The truck now has
> 92,xxx miles on it and just recently the engine was completely
> replaced due to a faulty crank shaft. After I got the truck back from
> the dealer I drove it for less than 300 miles. One night while
> driving it I noticed steam coming from the driver side headlight. I
> popped the hood to find that the radiator hose had popped off. I
> thought this was odd, but decided to reclamp it and replace the lost
> anti-freeze. The engine never redlined , but the oil pressure is now
> 20 at idle. The dealer swore that the problem was just a bad
> radiator hose and replaced it. After I picked it up and drove it to
> work (10 miles) it began leaking anti-freeze all over the place.
> After inspecting the engine bay there is anti-freeze all over the
> engine, battery, etc.. All hoses are still connected. My major
> concern is not the anti-freeze but the oil pressure, which is still at
> 20 when idle and 40 tops under accelation. Because this is a new
> engine I want to make sure that it was installed properly. Any
> thoughts? The dealer currently has the vehicle for the second time.