Changed the oil and tranny fluid on the Blazer last week, took it wheeling for about 45 min to an hour with no problems. Went to start it up today and it is now BILLOWING white smoke from the right exhaust. I turned it off to make sure I wasn't on fire, no fire, no funny buisness under the hood. I would think blown head gasket but no oil in the radiator or the res. and it doesn't idle high. Suggestions to check?

 

That's not good...

I'd pull the plugs and look for signs of a leak. I'd bet that the head gasket has blown on that side.

 

I agree. Have you checked the coolant level in the rad and is it low?