Chevrolet Performance Crate Engines 12677823

This new Chevrolet Performance crate engine (part 12677823) is a factory-built small-block long block intended as a reliable replacement or restoration foundation rather than a headline-horsepower build; Chevrolet Performance does not publish displacement or output figures for this particular listing, so treat it as a general-purpose small-block rather than a named performance package.

What ships assembled

A cast-iron block carries the oil pan, valve covers, and timing cover already fitted, though cylinder head material and camshaft type vary by the specific model you receive, since Chevrolet Performance notes both cast iron and aluminum heads, and both hydraulic roller and flat-tappet camshafts, appear across engines sold under this listing. Engine balance is internal, with a single-piece rear main seal.

What is not included

Everything downstream of the short block is left to the builder: no intake manifold, carburetor, distributor, exhaust, or fuel system components are bundled in, and the engine can be finished as either a carbureted or EFI setup depending on which induction system you choose. Confirm with the seller exactly which internal specification you are receiving before committing to heads, cam, or ignition components.

Buying a general-purpose replacement

Does this come fully assembled? Yes, as a long block, but without intake manifold, carburetor, ignition system, or accessories. What about coverage? It depends on the supplier you order from, so confirm specifics before paying. Professional installation is recommended to match cooling and exhaust components to your vehicle.

Specifications