Chevrolet Performance 19417352 - LSX cast-iron with 6-bolt main caps

The LSX Bowtie Block is hands down the strongest LS block you will find for the money. Tried and true north of 2000 horsepower, you'll have trouble finding the limits of the LSX block. For power potential, it is based primarily on the LS7 block's architecture, but for power handling it has been cast in iron and employs both thicker deck and bores, as well as employing 6-bolt cylinder head provisions for the max in cylinder head clamping capabilities.