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Message:: [QUOTE="Dino soar, post: 11570532, member: 208212"]I don't know what your level of engine building is so I can't advise you whether to rebuild or not yourself. The lpf liners means they are lower press-fit. In the earlier big cam engines, I think before big cam 4, the engines from the factory had upper press-fit liners. They worked, but they moved around quite a bit. So then the engineers realized they can install lower press-fit liners and they're much stronger. If your engine has upper press-fit liners then someone has to come out with the tool and they cut the block to fit the lower press-fit liners. If you are doing a rebuild and especially with more horsepower you want to have lower press-fit liners. As far as the crankshaft goes as long as the clearances are good it's just rebuilt. If the crank has to come out then the machine shop will magnaflux and cut it. Now on the front of the engine there is a balancer and if the engine has some time on it you should just replace it. The camshaft is the same as the crankshaft. If there's nothing wrong you just keep using it. I would only replace that if you are certain there is significant wear that it needs to be replaced. But what I would replace are all of the accessory and maintenance items and make certain that you have the timing tool and the timing of that engine is set correctly.[/QUOTE]