Founded in 1988, Leo's Machine Shop in Chula Vista is a BBB-accredited automotive machine shop at 170 Mace Street specializing in engine block and cylinder head machining for domestic and import platforms. Independent repair shops across the South Bay — including general-service operations such as Ted's Garage on Third Avenue — outsource head surfacing, valve jobs, and block decking to the Mace Street facility when in-house tooling cannot hold the required tolerances. Services extend beyond engine machining to flywheel resurfacing, rotor turning, and hydraulic press work, covering the ancillary machining needs that arise during clutch replacements and brake overhauls. Collision repair facilities such as Caliber Collision route cracked or warped aluminum heads to the shop for crack-detection, welding, and re-machining after severe-impact engine damage. The shop's highest-precision work involves boring and honing iron and aluminum blocks to oversized piston specifications using a Rottler or equivalent CNC boring bar, holding bore roundness within 0.0005 inches to achieve proper ring seal on performance and restoration builds.