Understanding the Trick Flow Small Block 350 Intake

The Trick Flow Small Block 350 intake manifold is engineered to deliver superior air distribution and flow dynamics for high-output Chevrolet small-blocks. Cast from high-strength aluminum, this aftermarket piece replaces restrictive factory cross-flow manifolds with a true single-plane (or dual-plane, depending on model) design that reduces turbulence and charge temperature. Typical applications include street/strip 350s with upgraded camshafts, cylinder heads, and carburetion or EFI systems. Key design features include raised runners, large plenum volumes, and polished ports that match popular ported cylinder heads.

Many enthusiasts pair a Trick Flow intake with their other engine components like headers, high-flow fuel systems, and electronic ignition kits to maximize system synergy. The manifold’s geometry is tuned for a specific rpm range, usually delivering peak gains from 2500 to 6500 rpm, making it suitable for daily drivers with performance leanings or weekend drag cars. For official specs and fitment guides, refer to the Trick Flow Technical Resources.

Cost Breakdown for the Trick Flow Small Block 350 Intake Upgrade

Pricing varies by retailer, finish type (natural, polished, or black double-coat), and whether the kit includes necessary gaskets and hardware. A detailed cost estimate helps you budget accurately before beginning the project.

Components and Typical Pricing

  • Intake Manifold (Trick Flow model TFS-K5120A or similar): $340 – $520. Polished versions may run $400–$550.
  • Gasket Set (include intake gaskets, valley pan, and end seals): $25 – $60. High-quality Fel-Pro or OEM equivalent recommended.
  • Bolts, Washers, and Studs (ARP or Trick Flow hardware kits): $40 – $90. Using torque-to-yield fasteners ensures consistent clamp load.
  • Carburetor or EFI Adapter (if upgrading from spread-bore to square-bore): $30 – $70. A spacer may also be needed for hood clearance.
  • Thread Sealant & Coolant (intake bolt thread sealant, anti-seize, fresh coolant): $15 – $30.
  • Labor (if professionally installed): $150 – $350, depending on shop rates and complexity.

Total outlay for a DIY installation typically falls between $450 and $1000. Professional installation adds labor but includes peace of mind for torque sequences and leak checks. For current best pricing, check vendors like Summit Racing’s Trick Flow intake selection.

Hidden Costs to Consider

  • New throttle gaskets or plenum gaskets if using a dual-plane model.
  • Potential need for a phenolic spacer to reduce heat soak.
  • Replacement of damaged vacuum lines or knock sensors during teardown.
  • Dyno tuning session ($200–$500) to fully realize power gains.

Step-by-Step Installation of the Trick Flow Small Block 350 Intake

Proper installation ensures a leak-free seal and maximum performance. Follow each step carefully, using the correct torque procedure provided by Trick Flow. The following guide assumes you are working on a standard small-block Chevy 350 in a GM vehicle or compatible swap.

Tools and Materials Required

  • Socket set (including 3/8” and 1/2” drive), torque wrench (inch-pounds and foot-pounds)
  • Torx or Allen bits for manifold bolts
  • Gasket scraper, razor blade, and brake cleaner or solvent
  • Thread sealant (Permatex #59214 or similar)
  • RTV silicone (ultra black or gray) for valley cover seams
  • Clean shop rags, vacuum, and compressed air
  • Engine coolant (distilled water + concentrate)
  • A friend to lift and align the manifold – it’s heavy and awkward alone

Preparation and Disassembly

  1. Disconnect the battery – always start with the negative terminal to avoid shorts.
  2. Remove air cleaner assembly, carburetor, and throttle linkage. Label vacuum hoses and electrical connections with tape or zip-ties.
    *Tip: Snap photos before disassembly for reference.
  3. Drain the cooling system. Open the radiator petcock and remove the lower hose to avoid coolant spill on the manifold gasket area.
  4. Remove distributor (mark its position) and any ignition wires crossing the manifold. Disconnect fuel lines if applicable.
  5. Unbolt the valve covers (if in the way) and remove any brackets for power steering or A/C that bolt to the intake.
  6. Remove the intake bolts in the reverse order of a tightening sequence (starting from the outside and working inward to avoid warpage).
  7. Lift the old manifold straight up. Work it gently back and forth if it sticks. Immediately stuff clean rags into the open lifter valley to prevent debris entry.
  8. Thoroughly clean the engine block’s mating surfaces. Use a gasket scraper and fine scotch-brite pad to remove all old gasket residue from the china walls (front and rear) and the pushrod valley. Wipe with acetone or brake cleaner until spotless.
    Critical: Do not let any residue fall into the engine. Use compressed air and a vacuum to remove grit from the lifter valley.

Installing the New Trick Flow Intake

  1. Apply a thin bead of RTV to the front and rear china wall interfaces where the gasket contacts the block. Some Trick Flow intakes use a factory-style valley pan instead — if you have a vented valley cover, replace it with a fresh gasket. For a conventional gasket kit, align the intake gaskets onto the cylinder heads. Use the locating dowel pins if provided.
  2. Carefully lower the Trick Flow manifold straight down onto the gaskets. Do not slide it sideways, as this can dislodge or tear gaskets.
  3. Insert all bolts and washers by hand. Ensure correct bolt length for each position; the package usually has a diagram. Some bolts go into blind holes (no sealant needed), others into water jackets (require thread sealant). Trick Flow instruction sheet specifies which holes need sealant.
  4. Tighten bolts in the manufacturer’s recommended sequence – typically starting from the center and working outward in a crisscross pattern. Use a 3-step torque: first pass to 75–80% of final torque, second pass to full torque, and a final check in sequence. Final torque values are usually 15–25 ft-lb (metric: 20–34 Nm). Over-torquing can warp the manifold or crack the runners. Use a quality torque wrench.
  5. Install the carburetor or EFI throttle body with a new gasket. Tighten it to 15–20 ft-lb. Attach the throttle linkage and kick down cable if applicable.
  6. Reconnect all other components: distributor (set timing marks), valve covers, vacuum lines, coolant hoses, and brackets. Fill cooling system with fresh coolant.
  7. Reconnect battery and prime the oil system (crank engine with ignition off for 15 seconds to build oil pressure before first start).
  8. Start engine and check for vacuum leaks, coolant leaks, and oil pressure. Let it idle to normal operating temperature, then re-torque the intake bolts after a heat cycle to account for gasket compression. Most manufacturers recommend re-torquing after 500 miles and again at 1000 miles.

Common Installation Mistakes

  • Using too much or too little sealant on intake bolts – follow Trick Flow’s instructions.
  • Forgetting to plug coolant crossover holes in the new manifold when required.
  • Not aligning the valley pan gasket or tearing the end seals.
  • Skipping the re-torque step – gaskets “settle” after heat cycles; loose bolts invite vacuum leaks.
  • Misreading the torque sequence – a cross-threaded bolt can ruin the manifold threads.

Expected Power Boost from the Trick Flow Small Block 350 Intake

The horsepower and torque gains depend heavily on your engine’s existing state of tune, compression ratio, camshaft profile, exhaust system, and carburetor size. Typical dyno results for a mild street 350 (9.5:1 compression, 270-degree cam, dual-plane Trick Flow intake, 650 CFM carb) show the following improvements over a stock cast-iron or aluminum intake:

  • Horsepower: +25 to +50 HP at the wheels, usually peaking between 4800 and 6000 rpm.
  • Torque: +15 to +35 ft-lbs, often flat across the mid-range (2500–4500 rpm) with good throttle response.
  • Volumetric efficiency: increases from ~80% to ~90% in the optimal manifold band.

These numbers come from Hot Rod’s intake manifold shootout tests and owner feedback at car forums. If you pair the intake with headers, a mild cam, and a vacuum-secondary 650–750 CFM carburetor, expect the higher end of these gains. For strictly stock long-blocks, gains skew toward torque rather than peak horsepower – about 15–25 HP increase is realistic.

Factors That Maximize Power Gains

  • Carburetion: Use a square-bore carburetor (like Holley 650–750) matched to the intake runner volume. Too large a carb kills low-end torque; too small strangles top-end.
  • Exhaust: Headers with 1-5/8” primary tubes and a free-flowing exhaust (2.5” or 3” system) allow the intake to work efficiently.
  • Camshaft: A performance cam with duration around 218–230 degrees at 0.050” and 0.480–0.510” lift will take full advantage of the high-flow runners.
  • Ignition timing: Retuning initial advance and mechanical advance curve after the intake swap can net another 5–10 HP. Use a dial-back timing light and a vacuum gauge for precision.
  • Fuel system: Upgraded fuel pump and regulator may be necessary if the existing pump cannot supply enough volume at high rpm.

Tuning and Optimizing After Installation

Even a perfect installation leaves potential on the table without proper tuning. The intake manifold changes the engine’s Air/Fuel ratio (AFR) and idle vacuum, requiring recalibration of the carburetor jetts, idle mixture screws, and accelerator pump. If you are using an electronic fuel injection (EFI) system, expect to redo the VE table and idle airflow settings.

Carbureted Tuning Steps

  • Set idle mixture: After engine reaches 180°F, adjust idle mixture screws for highest vacuum reading (15–18 in-Hg is typical for a dual-plane intake).
  • Check idle speed: 700–850 rpm for stickshift, 650–750 for automatic in drive.
  • Adjust primary jetting: Read spark plugs after a full-throttle pull. The plug should show a light tan color on the insulator tip and a slight color on the ground strap.
  • Accelerator pump: Increase nozzle size if you feel a stumble when cracking the throttle. A 0.035–0.040” shooter often works with Trick Flow intakes because of the larger plenum volume.
  • Secondary vacuum diaphragm: A lighter spring (like Holley black or orange) delays opening too soon and prevents bog. A heavier spring opens quicker for more aggressive cams.

For EFI systems, a wideband oxygen sensor and a laptop with tuning software (e.g., Holley EFI, MSD Atomic, or Speeduino) will allow idle, part-throttle, and WOT adjustments. Many installers rent a chassis dyno for an hour ($250-$400) to dial in the tune safely.

Long-Term Considerations

  • Heat soak: The aluminum Trick Flow manifold tends to heat up faster at idle. A phenolic spacer (1/2”) between carb and manifold can reduce fuel percolation in hot weather.
  • Boost prep: If you plan to add forced induction (supercharger or turbo) later, the Trick Flow intake’s thick deck and internal bracing support up to 8–10 psi with a plate system.
  • Emissions: In some jurisdictions, aftermarket intakes may need EO (Executive Order) numbers for smog legality. Trick Flow offers EO-carded versions for street-legal swaps.

Conclusion: Is the Trick Flow Small Block 350 Intake Worth It?

The Trick Flow intake delivers measurable, consistent power increases for a reasonable investment. With proper installation and tuning, a 350 engine can gain 30–45 wheel horsepower, transforming a tired daily driver into a responsive street performer or a competitive track machine. The upgrade’s cost-to-horsepower ratio (roughly $15–$20 per HP using the intake alone) makes it one of the best value modifications for a small-block Chevy. Pair it with complementary upgrades like a mild cam, headers, and a matched carburetor to realize the full potential of the high-flow runners.

Whether you are building a first project or refining a race car, the Trick Flow small block 350 intake remains a proven choice. For more technical data and fit‑ment information, consult the Trick Flow Chevy Small Block product page and read owner reviews on forums like Chevelles.com or Pro-Touring.com. With careful work and a tuned carburetor, the result is a power curve that will put a smile on your face.