In many cases part of the gain from doing a stroker kit is in the area of increasing the bore size. On an iron block it’s easy to go .30-inch, .60-inch, or even more over stock with no ill effects. With an LS engine it’s not that easy. The aluminum blocks have steel sleeves that aren’t terribly thick. You could go .30-inch over, making a 408, but the risk far exceeds the gain. If you want to go bigger than a 402, then look into having the block re-sleeved, or if weight isn’t an issue, look into one of GMs iron 6-liter blocks. Outlaw Racing bolted on the torque plate and honed our cylinders out to 4.005-inch. This was just enough to clean up the cylinder walls, and our sleeves are still thick enough to handle the abuse we plan on putting them through.