Ya they LIST up to a 4.34L there, but if you told them you want to go further, I am sure they will work with you. This would be done with either more bore, or offset grind on the stroker crank to get even more stroke out of it. This is all basic hot-rod'n for any machine shop and engine internal component manufacturer. I would be careful how much futher I pushed the displacement though. Displacement in a VQ is nice because you can get to your power without all the RPM, which can help spare you the oil pump drama... but you dont want to push the block too far. I would assume 4.5L is going to come out of a sleeve job and extra bore on top of the 4.34L stroker. I would never sleeve the block.
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