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One thing I learned and that you might want to know. I and my PO had trouble with fresh freeze plugs leaking. I tried all sorts of things but ended up using 3M's the Right Stuff to hold them in without leaks. There may be other stuff that's even better, but it was a big headache pulling and replacing.
It turns out, if you check the 64 engine manual you will see that the pressure rating for the radiator cap is 4 lbs, rather than the 14 lbs that Toyota sells. I think that that at least contributed to my blowing one of the freeze plugs one morning last November. I found one at NAPA rated for 4 lbs that fits, and it seems to be OK so far. I am not the only one who has had this issue with F135. The F145 is rated at 7 lbs, and that is available as well.
hmmm goood to know!!!
Should I chat with the rebuilder cats about this yeah?