The VK56's rod journals are .024 larger than the LS1/2/3. I would think you could have the crank turned. You would only be removing 24 thousands of metal off the rod journals for the LS3 rods to fit (if 2.1" works for the LS3, I'm pretty sure it would work for the VK56). You can pick up forged LS3 rods and Pistons for fairly cheap. This would save a lot of money on the bottom end.
Again, top end,, not a lot you can, nor even want to do, if you have the VK56VD. It already flows enough for 420hp and a relatively low compression 5.6L. I would just get better valve springs, maybe titanium retainers and call it a day.
Once I'm done overseas, I am seriously going to consider this.
VK56 parts
- Crank
- Main Bearings
- Seals and Gaskets
LS3 Parts
- Connecting Rods
- Pistons (just need to bore it out 1mm for LS1 pistons to fit)
- Rod Bearings
- Piston Rings
- Wrist Pins
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