Okie Dokie looked into the 64 with 63 head conversion. as far as bang for buck goes it isnt worth it.
3 things i found
1. gear box, engine, loom and ECU alone 2k plus
2. Suspension has to be totally redone to handle the weight and the only way to offset the added weight of the 2.4l was to put in coil overs and add a small weight to the rear end.
3. to make the car legal id have to get the car Engineered. and because of the head change id need to pay for an emissions test making the engineering cert costs sore.
so yeah not worth it for approx 105kw@fw
I did look into the other conversions listed the 2ltr and 1.8ltr again same issues as the 4g64 conversion cost and muking about just isnt bang for buck worth it. Plus the 1.5ltr DOHC is only 4kw less than the 1.8 and 10kw less than the 2ltr.
how ever if i had the cash id do the 4G63T & AWD conversion is by far the way to go with the mirage but its big bikkies. Min 20k. Looked into that years ago, engine & gear box need custom mounts. need to replace the floor pan with one from an EVO 4. custom CV and drive shafts and the list just goes on and on
So for me ive decided to stick with a 4G15, remove the turbo set up and sell off the parts for it then get a new bottom end for it, rebuild it all, get the head worked, quoted so far 2k and less for full recon, port and polish, bench flowed, head shave and 272 cams so that will give it some poke. got a few other legal mods planned too and with any luck make close too or break 100kw. anything over 95 id be very happy. when i first turboed my mirage it produced 94.7kw was only a SOHC running 6psi and with that i beat most v8 commies and falcons
but this time i have one advantage i didnt have last time, My current gear box has a LSD and built to take the power and too boot a custom clutch and Fly again to take the power coz nothing standard produced by Mitzis, Xtreme or Exceedy could handle anything properly over 90kw
