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lots of bits. head, pistons, I suspect cams (though I've not clocked them up) inlet and exhaust manifolds, and sequential ignition are all different. 197 runs constantly variable inlet cam timing, where 172/182 runs a straight switched phase shifter. In short, it's more than is practical to just...
if it's really stuck (and i've had to do this on a few balljoints) take the driveshaft out and use a drift and a hammer from aboveto punch the balljoint out of the hub. We use an air-chisel but a hammer will work almost as well
We (GDI/Omex) have a fully developed cable throttle conversion which uses the ph1 172 throttle body and an omex 600 ECU. Fully CNC'd bracketry and all sensors are included :)
I think you need a new oil pump pretty sharpish, but you it's worth trying a new oil filter first. Sometimes non genuine oil filters dont have the correct non-return valving in them so they dont hold oil when the engine isn't running. This means oil pressure (measured post filter normally) can...
a 2.0l from a 172 would be the easy option for the best power gains and least work. (some will say use an audi/vw 1.8t but there's a lot of fabrication to do)
Think I'd be tempted to use a 1.6 16v (k4m) for cheapness of buying the engine and spend what you've saved over a 2.0 on tuning it