421 Small Block Chevy Small Block Options:Rod I beam Std option - H beam Each short block is surface

Each short block is surface prepared by steel shot

LT1 LT4 Gm Performance new block in sealed GM crate manufacturer part number 19431901

Mesa Balancing Racing Engines uses our seasoned blocks to build our non sleeved long blocks which as all of our engines are fully machined  inhouse by our experienced staff as seen on our FB and IG page

Mesa Balancing Racing Engines uses only Dart Merlin or Brodix or GM bowtie new blocks to build these high HP packages which on pump gas can make 600 + depending on the cylinder heads and components used and well over 1000 with blower turbo or NO2

machining specs

421 Small Block Chevy Small Block Options:Rod I beam Std option - H beam Each short block is surfaceMesa Balancing Racing Engines uses only Dart Merlin or Brodix or GM bowtie new blocks to build these high HP packages which on pump gas can make 600 + depending on the cylinder heads and components used and well over 1000 with blower turbo or NO2. These new blocks are put through the same machining process as all our engines (we do not use new blocks without machining them like most of our competitors ) all blocks are inspected for cracks and flaws