I have a 1992 740 turbo wagon that came to me after the engine has overheated. The head is warped, coolant in oil, burned sensors and all that fun stuff. I measured the head after taking it off, it seems to be at its minimum (145.5mm), I understand the head has been machined and maybe more than once in its lifetime. I have a decent condition non-turbo head (same cast, but with Pulseair ports and non-turbo valves). I'm thinking maybe use it if I'm able to find suitable plugs for the Pulsair holes. Is it advisable to replace the valves? (my understanding is that exhaust valves on Turbo engines are different design). B230T heads seem to be hard to find in decent shape (the few of the recent ones I've seen on local yards were either 300+ K or also with overheating damage). Appreciate any advice.
Thanks!
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'98 V90 234K '98 V90 157K '94 940 NA 189K

the head can be heated in an oven and flattened that way, machining isn't the way to go. takes a couple of days because the warm up and cool down is slow, can't rush it. talk to a machine shop about that instead.

the turbos have sodium filled valves because of the higher heat. normal valves won't last. if you have to use a 230f head, you have to swap valves.

Will inquire about heating, the shop I went to did not offer anything like that, but I'll look around. However, the set of plugs for Pulsair holes (1277457) is only $35 shipped, and given the condition of the head, turbo valves do need to come out anyway for cleaning/resurfacing, so I'm tempted to use the better condition non-turbo head. Any problems with putting a used camshaft from the turbo head into the non-turbo? At 220K or so would it be advisable to change the valve springs (not terribly expensive at an extra $60 from Tasca). Actually, the springs in the non-turbo head only have about 150K on them. First time attempting this kind of work, but it's a project...
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'98 V90 234K '98 V90 157K '94 940 NA 189K

i've replaced a few b230 valve springs over the years, a new set is a good idea. i did forget about the turbo cam, you will need the non turbo 1. and you will have to check the valve adjustment. only did 2 adjustments in the past, 1 because of a cam swap.

Better make sure the valve aren't turbo specific, also. Go with the heat straightening, if you can find someone.