The Enduring Appeal of the Chevy 350 Small Block in Your Camaro

The Chevrolet Camaro, from its 1967 debut to modern iterations, has always been a symbol of American muscle. At the heart of many classic and custom Camaros lies the legendary 350 cubic-inch small-block V8. This engine is renowned for its nearly endless aftermarket support, forgiving nature, and immense potential for power. Building a reliable Camaro 350 small block is a rite of passage for many enthusiasts. The key to a successful build—one that balances daily-driver civility with track-day thrills—lies in selecting high-quality components and paying meticulous attention to rotating assembly balance. This guide focuses on using parts from Summit Racing, a trusted name in the performance industry, and emphasizes the critical role of a balanced crankshaft in achieving a smooth, durable, and powerful engine.

Understanding the Gen I Small Block Chevy 350

Before ordering parts, it pays to understand exactly what you are working with. The Chevy 350 small block was produced from 1967 through 2003. It shares the same basic architecture as other small-block Chevys: a cast-iron block with a 4.00-inch bore and a 3.48-inch stroke. While millions of 350s were built for trucks and passenger cars, the Camaro version often came with higher-compression heads, a more aggressive camshaft, and a four-barrel carburetor. For a performance rebuild, you have the option to source a core block or purchase a brand-new aftermarket block from Summit Racing.

Key components of the 350 include the cylinder block, crankshaft, connecting rods, pistons, cylinder heads, camshaft, valvetrain, intake manifold, and oiling system. Each part must be selected with the engine’s intended use in mind. A street-driven Camaro that sees occasional weekend drag racing has different needs than a track-only car. Summit Racing offers component packages tailored to specific power levels, making it easier to choose compatible parts. Understanding the basics of displacement, compression ratio, and camshaft timing will help you make informed decisions.

Engine Block Choices: Cast Iron vs. Aluminum

For most builds, an original cast-iron 350 block is perfectly adequate. It is strong, affordable, and can be machined to accept larger cylinder bores. However, if weight savings and cooling are priorities, Summit Racing carries aluminum blocks designed specifically for small-block Chevys. An aluminum block sheds around 50–60 pounds off the front of the Camaro, improving weight distribution and handling. The trade-off is higher cost and the need for a compatible cooling system. Both options will accommodate a balanced crankshaft and the necessary clearancing for stroker kits.

Choosing Summit Racing Components for Your Build

Summit Racing has been supplying performance parts for decades. Their in-house brand, Summit Racing™, offers components that deliver excellent value without sacrificing quality. They also stock top-tier brands like Edelbrock, Comp Cams, Holley, and ARP. Selecting Summit Racing components ensures that you get parts that are designed to work together, with technical support available from their experienced staff.

The Importance of a Balanced Crankshaft

The crankshaft is the backbone of the rotating assembly. A balanced crankshaft means that the rotating and reciprocating masses are evenly distributed to minimize vibration. Without proper balancing, your engine will suffer from premature bearing wear, crankshaft fatigue, and a rough idle that can be felt throughout the Camaro’s chassis. Summit Racing offers cast, forged, and billet steel crankshafts. For a street/strip 350 making up to 500 horsepower, a forged 4340 steel crank is an excellent choice. Summit also sells externally and internally balanced cranks. The 350 small block typically uses an external balance with a weighted flexplate or flywheel, but many builders prefer an internal balance for a cleaner, more stable setup. A balanced crankshaft kit from Summit comes with rods and pistons pre-balanced, saving you time and ensuring accuracy.

Cylinder Heads: Choosing Flow and Combustion Chamber

Cylinder heads have the single greatest impact on horsepower and torque. Summit Racing offers cast-iron and aluminum heads. For a Camaro 350, aluminum heads like the Summit Racing™ 180cc or 195cc swirl-port designs provide excellent flow out of the box. They reduce weight and allow for higher compression ratios without detonation. When selecting heads, consider valve size (typically 1.94-inch intake/1.50-inch exhaust for mild builds, 2.02/1.60 for more aggressive cams), combustion chamber volume (64 or 66 cc for street compression), and port shape. Summit’s CNC-ported heads deliver consistent flow numbers and are a direct bolt-on for your 350.

Camshaft Selection: Matching the Cam to Your Goals

The camshaft controls the engine’s character. A mild hydraulic flat-tappet cam like the Summit Racing™ 1101 provides a smooth idle and low-end torque—perfect for a daily driver. If you want a more aggressive idle and higher peak horsepower, a hydraulic roller cam from Comp Cams (available through Summit) offers lower friction and a broader powerband. For a balanced rotating assembly, the cam’s lobe separation and lift must not exceed the spring pressure limits of your heads. Summit’s website provides detailed cam profiles, including duration, lift, and recommended spring kit numbers, ensuring a proper match.

Intake Manifold and Carburetion

A high-flow intake manifold allows the engine to breathe. Edelbrock Performer manifolds (such as the 2101) are excellent for street use from idle to 5,500 rpm, while the Edelbrock Performer RPM Air-Gap (part number 7501) separates the intake runners from engine heat, lowering air temperature and increasing power. Summit Racing offers carburetor options from Holley and Quick Fuel Technology. A 650 CFM vacuum-secondary carb is a good match for a mild 350; bump to 750 CFM for higher performance. Pair your intake and carb with Summit’s gasket and bolt kits for a leak-free install.

Building the Engine: Step-by-Step Assembly

Engine assembly is where experience and precision converge. A clean, organized workspace and the right tools—including a torque wrench, dial indicator, and ring compressor—are non-negotiable. Follow these steps for a reliable build.

Prepare the Engine Block

Have your block machined to clean up the decks, bore to the appropriate size (typically 0.030 or 0.060 oversize), and hone with a torque plate to ensure ring seal. Install cam bearings and freeze plugs. Wash the block thoroughly with soap and water to remove all debris. Summit Racing sells block prep kits including brushes and cleaning chemicals.

Install the Balanced Rotating Assembly

Install the main bearings—Summit recommends King Racing or Sealed Power high-performance bearings. Lubricate with assembly lube. Place the balanced crankshaft into the block and torque main caps per specifications. Check crankshaft end-play with a feeler gauge; it should be 0.002–0.006 inch for most 350s. Next, install the pistons onto the connecting rods (if not done by a machine shop) and install them with the balance pads facing the correct direction. Use a ring compressor and a rubber mallet to seat the pistons. Summit’s balanced rotating assembly kits come with all pistons, rods, rings, and bearings pre-matched, making this step straightforward.

Install the Camshaft and Valvetrain

Lubricate the camshaft lobes with moly-based assembly lube (available from Summit). Slide the cam into the block carefully, avoiding nicking the bearings. Install the timing set: for a balanced setup, a double-roller timing chain is recommended. Line up the timing marks with the camshaft at the correct degree. Install the lifters, pushrods, and rocker arms. Adjust valve lash if using a solid-lifter cam; for hydraulic lifters, use the “zero-lash plus half turn” method.

Attach Cylinder Heads and Install Intake

Use new head bolts or studs from ARP—Summit stocks a full range. Apply thread sealant where required. Torque the heads in a crisscross pattern in three steps. Install the intake manifold using a quality gasket kit from Summit. Ensure the intake runners align with the heads. Torque in sequence per the manufacturer.

Balancing the Crankshaft: Why It Matters

The crankshaft balancing process is often misunderstood. A balanced crankshaft ensures that the center of mass of the rotating assembly aligns with the center of rotation. There are two types: external and internal. The production 350 external balance uses a weighted harmonic balancer and flexplate to counteract the heavier bobweights. Many performance builders prefer an internal balance, where counterweights on the crankshaft itself handle all the balance. Summit Racing offers both styles. If you choose an internal balance crankshaft, you can use a neutral balance damper and flywheel, reducing rotating mass and improving throttle response. To achieve a perfect balance, take your complete rotating assembly (crank, rods, pistons, rings, bearings, and damper/flexplate) to a professional balancing shop. Summit Racing can provide a pre-balanced kit, but final verification is always wise. A properly balanced engine will idle smoothly, rev freely, and last longer.

Testing and Tuning Your Built 350

After assembly, the engine must be broken in before it can be tuned for maximum performance. Set the initial ignition timing—typically 10–12 degrees before top dead center for a mild 350. Prime the oil system by spinning the oil pump with a drill or using a pre-oiler kit from Summit. Start the engine and run it at a fast idle (2,000–2,500 rpm) for 20–30 minutes to seat the camshaft and piston rings. Vary the speed slightly during break-in to help rings seat. After break-in, change the oil and filter.

Final Tuning Steps

  • Carburetor Adjustment: Set idle mixture screws for highest vacuum, then adjust idle speed. Summit sells vacuum gauges and carburetor tuning kits.
  • Ignition Timing Curve: Use a dial-back timing light to check total advance (typically 34–36 degrees at around 3,000 rpm). Install a vacuum advance canister for street driving.
  • Check for Leaks: Inspect all gasket surfaces, oil pan, front and rear seals, and coolant connections. Use Summit’s pressure test kit to verify no leaks.
  • Drivetrain Integration: Ensure your transmission and rear axle can handle the output. A TREMEC manual or a TH400 automatic are popular choices.

For final tuning, consider a chassis dyno session. Summit Racing offers parts like EFI conversion kits (Fitech or Holley Sniper) if you want to ditch the carburetor. These systems self-tune and work well with a balanced 350.

Conclusion: A Reliable and Powerful Camaro 350

Building a Camaro 350 small block with Summit Racing components and a balanced crankshaft is a project that pays dividends in performance and reliability. By carefully selecting your block, crankshaft, heads, cam, and induction system, you create an engine that responds to the throttle with crispness and durability. A properly balanced rotating assembly eliminates annoying vibrations and extends engine life, while Summit Racing’s comprehensive catalog and technical support simplify the selection process. Whether your Camaro is a weekend cruiser or a strip warrior, this build approach delivers the legendary small-block experience at its best. For further reading, check out this Super Chevy article on 350 builds, or explore Engine Builder Magazine’s detailed guide on crankshaft balancing. For parts and support, visit Summit Racing directly and their balanced rotating assembly kits. Happy building.