Re: 1989 R31 Silhouette
Just get a turbo manifold from a vl turbo or Ebay, and throw a turbo on the stock RB30. My mate has done this to his stock RB30 motor in his HR Holden ute and it made just over 180rwkw/240rwhp on 8psi. He has an extra injector operated by a Hobbs switch and is using a very small Supra intercooler (to fit behind the standard grille without cutting the car up)
The twin cam idea is nice, but imo, not really cost effective. If you really want the twin cam head, just put a complete RB25 into the bay.
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