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FE Technical Forum / Re: 1964 Thunderbird 390FE - Overhaul thoughts and considerations
« on: October 20, 2019, 09:11:19 PM »No one has mentioned this but, the real key, as to whether you can overhaul your engine, is how much taper it has at the top of the ring travel and before you can decide on that, you'll have to measure the cylinders at that point.
For me, .005, is to much. Your ring gap opens about .015 for .005 taper. I wouldn't want more than .030 gap, on a overhaul.
I guess I am going to have to tear into this beauty and see what I can see, I really appreciate all the advice so far! I am going to have plenty of questions upcoming as well as I get into this. I am hoping that I can do an overhaul, just to get a feel for everything. I am willing of course to have it machined - oversizing the bores, cleaning up the block. I mean, I am pretty sure it is going to need a valve job - still have to look and see how bad it is. If I do this as a overbore and a bunch of new parts it will change things, I will need to wait quite sometime before I do that - that is going to take some dollars. I need to learn more about how engines work as well - how the springs work with the cam and how displacement is changed - so on. My understanding is if you bore it over you change the displacement - been reading the forumla's online and trying to figure it all out. I know its not rocket scienc.e, but it is a complex thing - at least for me.
