Top end rebuild

[Ruan]

That's a J4RS head... Of course, valves are bigger, but the 1.8 head is silly restrictive as stock.

But I'd get an S16 ECU or similar on the case or even a GTi6 ECU so you can take it to be remapped, cause porting out the head and if you put better cams in, it's going to be very lean on a stock Sagem 1.8 ECU. I'd go with a Bosch off the S16 or the Marelli off the GTi6. You'll probably find with a ported head and decent manifolds, a S16 ECU would be not a MASSIVE amount off, will just need the fuel trimming and the ign trimming in the right places to suit the engine. With the right bits done, I wouldn't be surprised if you saw 145-150 out of this engine with simply with decent cams and a few other bits and bobs.