Edelbrock announced the release of its new cast-iron engine blocks for small- and big-block Chevrolet applications. Edelbrock is now offering this option with new engine blocks that are cast and machined in the USA… and made to last! These are the same engine blocks used by Edelbrock for all of its small-block Chevy crate engines as well as its 540 RPM and 555 RPM big-block Chevy crate engines. The blocks are precision machined to Edelbrock’s specifications, and they feature standard factory specifications for popular small-block and big-block applications. They also feature splayed main caps and priority oiling for improved performance and reliability. Options for 1- or 2-piece rear main seals are available for both small- and big-block applications.