has anyone here rebuilt a 4.6??I'm lookin at a 93 (i think) crown vic that that he says has a rod knock, its only got 80 thousand on it and its pretty clean. are these a hard engine to work on?? he said it doesnt smoke, its got good oil pressure and there's no antifreeze in the oil, so it can't be in too bad of shape on the inside what do you guys think?? i have no experience with one of these so please help!!
The timing chains and OHC's, getting the cam timing correct. These blocks can only be over bored .020, but I'd doubt that you would even need to bore it anyway. If it is indeed a rod knocking, I would just put a crank kit in it and be done with it. These engines last a very long time usually. If you do rebuild the whole thing, get good valve guide seals, the early 90's engines were bad about them leaking and burning a little oil..
If it is got good oil pressure and nothing showing in the oil then why does he think it has a rod out of it. These engines where a little prone to piston slap. Do a little diagnostic work. if it is a rod knock then you can disconnect the spark plug wire from each cylinder one at a time and the knock will either go away or be noticeably reduced when you find the cylinder with the problem. I have also seen them knock when they had a piece of carbon bouncing around in a cylinder. An automotive stethoscope will also tell you if the knock is high or low, low being an indication of a rod.