Let's get started with a solid foundation for this build. Forget about salvaging a junkyard block and all the machining involved in bringing it back to life. A Dart "Little M" small-block was a solid choice. The Little M block is of an iron alloy casting and comes with billet steel 4-bolt main caps and a 4.125 cylinder bore with extra thick cylinder walls. Lirones Motorsports gave it a touch more. Each cylinder measures in at a 4.155 bore. With a stroke of 3.800-inches, it brings the total displacement of this Mouse up to 412 cubic inches.