I know it's completely insane but there is living proof driving around in Tampa. My buddy actually had a 420A bought a 4g63 not knowing any better and ended up cutting out the whole sub framing and made the 4g63 work. He's now running a Green and other goodies, and should turn a decent time at the track if it does not blow up first.
This project was actually done on a budge.
oh, btw, he suggest to anyone else NEVER to try it.
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Heavy car with a 2.5L