[wafrederick]

The 3400 is known for eating camshafts and washes the cam bearings out.The block is automatically junk after this happens and I have seen in many 3100s and 3400s do this.The last one was out of a 1999 Venture Minivan.If you think it is the camshaft because is hollow in the center,you are wrong.It is the block when it was casted in China,the journals are casted offset and GM put in cheap cam bearings.Jasper,a top of the line reman engine company fixes this by alighn boring the cam journals and puts in upgraded cam bearings.I was told this by a Jasper rep that I know since my father is a Jasper dealer.The rep brought in a part of a broken cam out of a 3100 as a sample and explained this.