Vortec 4.3L v6 Rocker Arm Issue Please Help!
Hello everyone Im new here, and Im hoping someone can help me out. I have a 4.3 vortec in my boat was a replacement for the Volvo penta in the boat. Prior owner partially submerged the engine and took water in the engine. Long story short, we disassembled to the block, got the water out, new gaskets from the block up, Intake manifold was cracked (which was allowing water in) replaced it, got it timed and it ran rough for a bit, took off valve covers, notices we bent 9 push rods, due to over torquing bolt on the rocker arms, now they dont have studs with a nut, just bolts. We pulled the lifters which have rollers, they seem ok, oiled the lifters before we put them in ,we reassembled with new push rods, new push rod guides and torque says 10 ft pounds on the rocker Bolt after the lash is out of the push rods go a half turn. Well we do this and follow the firing order then rotating and tighten the other rockers as the book says, and no matter what we do the bolts come loose on 3 or more rocker arms. I belive this engine is a 2003 model un sure if its a marine engine but the prior owner says it is. But it has bolts in the rocker arms not studs with nuts. Maybe the threads on the head for the bolts stripped? I don't know. We have disassembled and reassembled this 3 times, Im fed up. Anyones Knowledge will be greatly Appreciated. Thanks, Derek