Well, actually 346 ci
There are the sleeved, or bored out motors like the darton sleeves out on the market, then also there are the factory c5r blocks. Well ive seen that block available in cast iron, but is it also available from gm in aluminum?
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What block is cast iron?
The LS1, LS6 and C5R are aluminium blocks. The lac4 and LQ9 are the iron blocks, that can be punched to 408ci - quite a couple of Z06's and Coupes I know of with iron block 400's running 200+ shots of nitrous.
Even with the Darton sleeves 436ci is pushing - however, there have been a few attempts to run a 454ci with the LS6 block resleeved and bored.
The only such project I know of, has run into heat soak issues - and the between bore walls being a little thin for comfort - even with the Darton sleeves.
But where there is a will - there is a way - so someone will do it...