GM Small Block 350ci Engine

The GM Small Block 350ci Engine, also known as the GM Small Block 350ci Engin, is one of the most iconic and widely used V8 engines in automotive history. Here’s an overview of its key features, history, and applications:

Engine Basics

• Displacement: 350 cubic inches (5.7 liters)

• Configuration: 90° V8

• Block Material: Cast iron (aluminum versions also exist)

• Bore x Stroke: 4.00″ x 3.48″

• Firing Order: 1-8-4-3-6-5-7-2

• Valvetrain: Overhead valve (OHV) with 2 valves per cylinder (pushrod design)

• Fuel Type: Gasoline (carbureted and later fuel-injected versions)

• Power Output: Typically ranged from 145–370+ horsepower, depending on year and configuration

History

• Introduced: 1967 (as a larger displacement version of the original 265 ci small-block from 1955)

• Produced Until: Factory production through the 2000s; crate engine versions still available

• Legacy: Part of Chevrolet’s small-block family, it became the gold standard for American V8 performance and durability.

Applications on GM Small Block 350ci Engine

Used across a broad range of GM vehicles, including:

Cars

• Chevrolet Camaro

• Chevrolet Corvette (C3 and C4)

• Chevrolet Impala

• Chevrolet Chevelle

• Chevrolet Nova

Trucks & SUVs

• Chevrolet C/K pickups

• Chevrolet Suburban

• Chevrolet Blazer

Marine & Industrial Uses

• Common in boats, hot rods, and aftermarket custom builds

Variants

• L48 – Standard in many passenger cars

• LT-1 – High-performance version (1970s)

• L82 – Corvette and Camaro performance engine

• ZZ4 / ZZ6 – Performance crate engines

• Vortec 5700 (L31) – Final production version with modernized heads and fuel injection

Why It’s Popular

• Parts Availability: Incredibly easy to find and cheap to build

• Aftermarket Support: Massive—intake manifolds, camshafts, heads, stroker kits, etc.

• Ease of Maintenance: Simple design with proven reliability

• Swap Friendly: Common engine for hot rod and restomod projects

 Detailed Technical Specs (Base 350)

 Popular Performance Upgrades

1. Cylinder Heads

• Vortec Heads (L31): Great flow and swirl characteristics. Bolt-on for instant power gains (~30+ hp).

• Aftermarket Aluminum Heads: Brands like AFR, Edelbrock, and Brodix offer better flow and weight reduction.

2. Camshaft

• Upgrading to a performance cam (e.g. Comp Cams XE262H or Lunati Voodoo) can significantly improve torque and high-end horsepower.

• Consider hydraulic roller cams for longevity and better valve control.

3. Intake Manifold

• Dual-plane intake (Edelbrock Performer or RPM): Ideal for street torque.

• Single-plane intake: Better for high-rpm horsepower (track/race use).

4. Carburetor/Fuel Injection

• 750 CFM carb (Holley, Edelbrock) for performance builds.

• EFI conversions (e.g., Holley Sniper, FiTech) offer modern drivability, cold starts, and tuning ease.

5. Exhaust

• Long-tube headers and high-flow exhaust help unlock additional horsepower and torque.

6. Ignition

• HEI distributor upgrade (High Energy Ignition) is a very common and effective mod.

• Digital ignition boxes (MSD 6AL, etc.) allow finer tuning and better spark control.

 Crate Engine & Stroker Options

Chevrolet Performance Crate Engines

• ZZ4 (355 hp): Reliable and street-friendly.

• ZZ6 (405 hp): More aggressive cam, aluminum heads, roller valvetrain.

• SP350/357: Torque-heavy street motor with modern updates.

Stroker Kits

• 383 Stroker: Increases displacement by using a longer stroke crankshaft (3.75″). Popular and cost-effective—typically good for 400+ hp and 450+ lb-ft.

 Common Swap Projects

The GM Small Block 350ci Engine is a go-to swap for classic cars, trucks, and hot rods due to its compact size, parts support, and simplicity. It’s been swapped into:

• Classic muscle cars (Camaro, Chevelle, GTO)

• Vintage trucks (C10, F100)

• Jeeps and off-road rigs

• Street rods and rat rods

• Boats (marine variants exist)

Tips for Building a Reliable GM Small Block 350ci Engine

1. Balance your combo: A big carb with tiny heads = poor results. Match your cam, heads, intake, and exhaust for best performance.

2. Use quality gaskets and fasteners: Cheap parts = future headaches.

3. Cooling is key: Upgrade the radiator and use a high-flow water pump for street and performance builds.

4. Ignition timing: Don’t underestimate proper tuning—can make or break your build.

Summary

The GM Small Block 350ci Engine is beloved for its versatility, power potential, affordability, and ease of installation. Whether you’re doing a budget build, aiming for a 500+ hp stroker, or just want a reliable cruiser engine, the 350 is a time-tested workhorse.

Would you like:

• A specific build recipe (e.g. budget 350 with 400 hp)?

• A list of compatible vehicles for engine swaps?

• Help identifying a casting number or engine code?

• Torque specs or assembly guides?