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Actually, there is quite a bit that can be done.
The US spec piston have a Huge dish in them to lower compression, as Euro piston looks more like a conventional piston sans the dish, with that in mind 10-1 slugs are available.
The Euro spec cams bring the redline up around 62-6500 if I remember. The exhaust is a Far better design (essentially cast headers) giving a true dual sytem.
I have also read that the Euro spec heads have different ports, but have yet to physically inspect them myself.
The short of it is you go round 140 ish HP to right about 200..and upwards of that could be easily seen going w/ a custom/hotter grind on the cam.
If you are sticking w/the US motor it begs to have a blower installed..compression as low as that could take an Easy 7-8 lbs.
Speaking of stick, I'm working at getting all the neccesary bits to install a richmond 5 (or possibly 6) speed in a 126 Coupe...
Jonathan
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