This is the block to buy if you want to build a serious street car or if you want to head to the race track! The GM Performance Parts Bowtie Sportsman block has been the starting point for countless racing engines. These iron blocks are available in a variety of finish options to build almost any engine combination. Most of these blocks are secured by Grade 8 bolts. All blocks in this family have a 9.025" deck height. The Bowtie Sportsman blocks are a great foundation for your serious street car, circle track, or drag car that makes between 350 and 500 horsepower.