What is a short block?

A short block is a type of engine block that typically refers to an engine block that has been rebuilt or repaired with new pistons, piston rings, bearings, and gaskets, but retains the original crankshaft and connecting rods. This typically involves removing the cylinder heads, pistons, and crankshaft from the engine block and replacing any worn or damaged components before reassembling the engine.

Short blocks are often used in engine rebuilds as a cost-effective way to refresh an engine without completely disassembling and reassembling the entire engine. This can save time and money while still improving engine performance and reliability. Short blocks are commonly used in performance engine builds where the original crankshaft and connecting rods are still in good condition and can handle the increased power output.

Overall, a short block can be a good option for rebuilding an engine that still has a solid crankshaft and connecting rods, but needs new pistons, rings, bearings, and gaskets. It is important to ensure that all components are properly matched and assembled to ensure optimal engine performance and longevity.