I replaced the head gaskets on one of my friends blazers and I tightend the rocker arm bolts to tight I'm sure that is what happened to you . It just turned over like 90 mph.

 

I dont know. The engine is out of the truck now and tore back down to the heads with all the rockers out and brand new oil wasted.. No turning back for a rebuild now. At least this way Ill know what I have and I wont have to worry anymore about the what ifs. I mean something still could go wrong but a lot less likely.