421 Small Block Chevy Small Block Options:Rod I beam Std option - H beam 4 OEM Fully Machined engine

4 OEM Fully Machined engine blocks and  forged Steel  crankshafts  New Forged 4340 H Steel connecting rods and  your choice of Forged pistons and pins (see piston option and prices in the dropdown menu )

NOTE: THESE SHORTBLOCKS ARE CUSTOM BUILT FOR YOUR APPLICATION AND TYPICALLY TAKE 6-8 WEEKS

065  bore New is sealed GM crate manufacturer part number 12673475

MBRE uses GM blocks completely balanced and blueprinted in house for the GM series complete engine packages these engines can be fully assembled and delivered as either Dyno tuned or complete with no dyno

MBRE uses a 6

421 Small Block Chevy Small Block Options:Rod I beam Std option - H beam 4 OEM Fully Machined engineMesa 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