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Forgive my ignorance but the bottom end for an RB31 comes from what? A VL Turbo? R31?

Spot on, RB30ET (Turbo) or RB30E N/A, plus forged bottom end (rods and pistons) with 87.5 mm pistons = 3068 cc's. Hence RB31 (3.1 litres). :D

Sydneykid - Unfortunately I'm having to sell her as soon as she's fixed so I need to do this as cheaply as I can but the RB31 engine could be my next project I think!

Doughboy - Thats the price I've had from 4 different places. Most quote AUS$4000 just for the Labour (45hrs x $90/hr) and a further $4000 for the crank!

I can get a RB26 for $5000 and get it fitted for free plus I take everything off my old engine - Turbo, Injectors etc which will get me some money back too.

I'll need to get some stuff for the new engine (another AFM/Filter, GTR downpipe, intercooler piping, ECU & loom etc) before I get started.

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