ok i tore the engine back apart completely and cleaned everything and put it back together. ITS STILL RUNNING HOT. Im jus having trouble understanding what the problem is to make it run hot when everything looks fine. Im not doubting you at all cause im not familiar with them at all but im just curious. What are some things to check for? and also where is a good website to find a new sh .28 engine for the best price?
I wish I could be more specific but I've seen this exact problem before on a friend's savage, almost identical engine. It would start, idle, and run perfect. Was running plenty rich but once you got close to half a tank it would just overheat for no apparent reason. We took it apart, couldn't find anything wrong with it. I sealed everything you could imagine, but it didn't help. Tried using a different carb, same thing. He wound up replacing it, we never could figure out what was wrong. The problem points to an air leak somewhere, but we never found it. As far as replacements go, the least expensive is usually eBay. I found a new engine from an avalanche from a new teardown that was complete with engine mounts, header and pipe, carb, flywheel, clutch bell and pullstart for$120 with free shipping for another truck I was rebuilding, but I just checked eBay and right now there were no good deals to speak of. You might have to wait a few days for someone to put up some new inventory. To me, for that price I'd wait until one comes up. If I see one post I'll send you a link.