Ninjaneer11

Yeah, the t stat bolts were correct. I don't have much history on the truck, but I know whoever set the timing didn't do it by the book. L20B motors are supposed to be set at the #2 cam gear mark initially and this was set at #1.

Hey Guys, long time lurker, first time posting. I am going through a rebuild on the L20B out of my 620 and had a similar problem. I've been scratching my head as to how the guide would break like it did and this had shed some light on it. A few dings in the oil pan, scratches on the front cover, and almost worn through oil jet were the result. I'm surprised it didn't do more damage. I appreciate the knowledge that gets shared here.