Overheating Mystery - Your Opinions Appreciated

My guess is that the radiator is either undersized or the rodding/flushing did not clear it out enough to work well. I had the

|| 1992 Toyota 4WD with a 22RE 4 cylinder. The motor is out of a 1985 || Toyota which was a 22R (the E designated fuel injection). I took the || 22R out of the '85 model where it ran quiet and had sufficient power || and transferred my intake and injection system to it. At first crank || up the motor was a noisy (valvetrain clatter) and has been ever || since. I have set the valve clearance several times with no change || to amount of power or noise. The motor seems like it is lacking || power and has a lot of valve clatter when trying to accelerate. Also || when trying to run above 70mph the temp climbs up past halfway mark || and will continue on to three-quarter mark if I don't back off and || yesterday backing off didn't help. I had to pull over and let it || cool down. The fan clutch is good (new), water pump new, t-stat || fairly new, radiator has been rodded and flushed, timing good. The || vavle clearance is as follows: Intake .008 / Exhaust .012 || (set cold). Motor has about 175,000 miles on it. || || Thanks for any help you folks may have to offer! || || KB

Could the valve springs be weak? maybe too tight?

On the heating issue, I've never had an actual problem, though, I did have a cap go bad and it acted like it wanted to overheat... then on a rebuild of a mitsu eclipse, the block had an air bubble in it, and I couldn't purge it, and it acted like it wanted to overheat... finally someone told me after a good rebuild where you're taking hoses off and such, to purge the system one good time with plain water and while at the time I wasn't sure what I was doing, while hot, I drained it and put fluid back in and it never burped again....

etc etc.... have you cross referrenced the part numbers for all you intake plenum parts and your ecm parts and various sensors to check wether or not the parts were compatible? ie different intake plenum heights will cause all kinds of problems with mixture control due to expected out puts at the o2 sensor in the tailpipe. ECM may compensate by leaning the mixture or advancing the timing, both of which can lead to increasing temps. Just a supposition......maybe , maybe not kinda thing. I had a chevy head replacement that led to a similar problem , turned out the parts runner our shop used supplied a similar head that required a different timing cover so we had to time by ear. Until we figured that out and he copped to it we couldnt keep it running at constant temps or ewven worth a shit. Lucky we didnt eat a vaslve thinking back on it. Shit happens..... MLM