What's the difference between a 350 and a 383 stroker?

The 350/383 distinction matters enormously for collectors and drivers alike. Here's the complete picture from both a mechanical and a value perspective.

The Factory 350 (LT1, L48, L82, etc.)

The Chevrolet 350 small-block was produced from 1967 through the early 2000s in various forms. Bore: 4.00 inches. Stroke: 3.48 inches. Displacement: 350 cubic inches. Factory variants ranged from the LM1 (145 hp in smog-era applications) to the LT1 (330 hp in 1969 Z/28s, unrelated to the modern LT1) and the L82 (220 hp in late-1970s Corvettes). The 350 is the baseline for almost all small-block Chevy performance work.

The 383 Stroker — How It Works

The 383 combines a standard 350 block (4.00-inch bore) with the 400 small-block crankshaft (3.75-inch stroke versus the 350's 3.48-inch stroke). The additional stroke increases displacement from 350 ci to 383 ci without requiring a larger block. The benefit: more piston travel per revolution means more torque without necessarily spinning faster. A well-built 383 with appropriate heads and cam typically produces 380-430 hp and 430-460 lb-ft of torque — significantly more torque than an equivalent naturally-aspirated 350 build.

The Collector's Perspective

For a numbers-matching, investment-grade classic car: a 383 stroker is a replacement engine, not a factory unit. It eliminates any numbers-matching claim and reduces value on cars where documentation and originality are the primary value drivers (COPO Camaros, Z/28s, Corvette L48/L82 cars). If you're buying a car represented as numbers-matching and it has a 383, that claim is false by definition.

For Driver Cars and Restomods

The 383 is the ideal engine for a driver-quality restomod Camaro, Chevelle, or Nova: more torque than a stock 350, same external dimensions, proven reliability, and excellent parts support from every speed shop in the country. For a car you intend to drive rather than show or invest in, the 383 stroker is a sensible choice.