Chevy 350 TBI Performance Kit

Why Does Your TBI 350 Need a Performance Kit?

Cast Iron Manifolds Strangle and Cook the Bay

The factory logs wrap the 350 in backpressure and hold heat against the plug wires and starter. Two decades of heat cycles crack them between runners and snap the studs that hold them.

Every cold-start tick is the manifold negotiating its retirement. Shorty stainless headers replace the whole failure pattern with equal-length tubes that scavenge instead of smother.

The EGR Circuit Heats the Intake It Feeds

Throttle Body Injection depends on cool, dense air entering the manifold, and the EGR port constantly feeds hot, soot-heavy exhaust back into that same tract. Carbon builds, passages narrow, and vacuum leaks follow the aging valve.

Blocking the port keeps the charge air cool and stops the carbon at the source, which is why the plate kit rides along in every serious 350 TBI performance build.

Tight Bays Punish Long Tubes

S10 and S15 V8 swaps and narrow-frame classics leave no room for full-length primaries against steering shafts and frame rails. Builders either cut the chassis or give up flow.

Hugger-style shorties deliver the scavenging gains in a compact package that drops between the frame rails without clearing anything.

What Can a Chevy 350 TBI Performance Kit Solve?

Mid-Range Torque From Shorty Scavenging

Equal-length mandrel-bent primaries accelerate exhaust pulses and pull the next cylinder's charge behind them. Backpressure drops, underhood temperatures fall, and the 350 gains exactly the mid-range torque these trucks live on.

Denser Intake Air Without the Soot

The billet EGR delete plate seals the recirculation port with CNC-machined precision, so the manifold breathes clean air instead of exhaust. Cooler charge air, no carbon accumulation, and no EGR vacuum leaks or related check engine lights in off-road and performance applications.

A Complete, Serviceable Install

Everything lands with fresh gaskets and correct bolts. The header gasket and bolt kit means no reusing stretched fasteners or baked seals, which is the difference between a one-weekend job and a comeback leak.

Shop Chevy 350 TBI Performance Kit by Chevrolet Engine & Fitment Guide

1. Exhaust Performance & Headers

Focus: This category focuses on replacing restrictive cast iron manifolds with compact stainless tubular headers.

Solves: It solves cracked manifolds, broken studs, cooked plug wires, and the clearance problems long tubes create in swap bays.

• T-304 Stainless Shorty Headers (Hugger Style) - Fits the 5.7L 350 SBC in Chevy GMC C/K trucks, Blazers, and S10 S15 V8 swaps (1987-1995). Equal-length stainless primaries that boost mid-range torque without steering shaft or frame rail interference.
• Header Gasket and Bolt Kit - Fits Small Block Chevy shorty headers as service hardware. Fresh gaskets and correct fasteners for a leak-free first install.

2. Induction & Emissions Bypass Hardware

Focus: This category focuses on sealing the EGR port on TBI intake manifolds for performance applications.

Solves: It solves hot soot recirculating into the intake, carbon buildup, and the vacuum leaks and codes a tired EGR circuit invites.

• EGR Delete Block-Off Plate Kit - Fits the 5.7L 350 SBC TBI intake manifold in Chevy GMC C/K trucks and Blazers (1987-1995). CNC-machined billet plates that close the EGR port, keeping intake air cooler and denser.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

Premium Quality & Rigorous Testing

Our EGR, DPF, and CCV delete kits are engineered from premium-grade materials and subjected to brutal quality control and field testing. Unlike generic alternatives, our products are built to withstand extreme heat and pressure, delivering unmatched durability and long-term stability when your rig needs it most.

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We aren't just selling parts. We live in this industry. With two decades of hands-on experience providing specialized modification solutions for heavy-duty truck owners, our upgrades have been extensively proven across every driving environment, from daily towing to high-performance tracks.

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Thousands of diesel owners trust us to unlock their engine's true potential. Our massive library of positive customer feedback and successful build case studies proves one thing: our kits deliver real horsepower, lower EGTs, and flawless reliability in the real world.

Engine Architecture Notes Behind Chevy 350 TBI Performance Kit

The TBI era spans 1987 through 1995 on the Gen 1 small block: the 5.7L 350 (L05 and stablemates) with its two-injector throttle body squatting on a low-rise aluminum intake, fed by a conventional distributor ignition. In 1996, the Vortec L31 arrived with different heads, a multipart intake, and Sequential Fuel Injection, ending parts interchange with the TBI manifold. That 1996 split is the fitment line for everything here: TBI-era intakes and EGR geometry on one side, Vortec-specific parts on the other.

The known weak points of the TBI 350 are thermal and restrictive: cast iron manifolds that crack and shed studs while heating the bay, and an EGR circuit that loads the intake with soot. Shorty headers attack the first; the block-off plate the second. Confirm your injection generation before ordering, because a 1993 TBI truck and a 1998 Vortec share displacement and almost nothing else.

Maintenance Tips for Chevy 350 TBI Performance Kit

Keep a TBI small block honest with a rhythm built around its failure points:

• Soak header bolts with penetrating oil the night before - Twenty-year exhaust fasteners snap instead of backing out when rushed.
• Re-torque header flanges after the first 500 miles - Fresh gaskets settle with the first heat cycles; one snug pass seals them for good.
• Inspect plug wire boots for heat glazing monthly - Tight bays put wires near primaries; a glazed boot is a misfire waiting for a rainy day.
• Check TBI base gasket vacuum each season - The throttle body seals age, and a lean leak mimics tuning problems nobody can find.
• Cap the EGR vacuum line cleanly when installing the plate - A capped and sealed circuit keeps the computer from chasing a missing component.

Off-Road Use Statement for Chevy 350 TBI Performance Kit

Emissions delete hardware is not legal on public roads. The EGR delete block-off plate removes or defeats an emissions control device, which is tampering under federal law, and the installer accepts that responsibility. These parts are intended for competition and closed-course off-road use only, and are not approved for street registration, inspection, or daily on-road driving.

Block-off hardware has to be paired with the matching simulator or ECU support, because the computer will set codes and turn on the check engine light the moment it stops seeing the component that was removed. Street-legal hardware in this collection, such as the stainless headers and gasket or bolt service kits, carries no such restriction where local header rules permit.

FAQs About Chevy 350 TBI Performance Kit

What does a Chevy 350 TBI performance kit include?

The kit pairs the two bolt-ons that matter most on a Throttle Body Injection 350: T-304 stainless shorty hugger headers and a billet EGR delete block-off plate kit for the TBI intake. A header gasket and bolt kit completes the install.

Together, they free the exhaust and clean the intake path, the foundation for any further 350 TBI performance build.

Will these parts fit my 1994 C1500?

Yes. The collection fits the 1987-1995 TBI-era 350 small blocks in Chevy and GMC C/K trucks and Blazers, plus S10 and S15 V8 swaps using the TBI platform. The 1996 and later Vortec engines use different heads and intake geometry.

Confirm your injection generation against the table or send our team your VIN before ordering.

Why choose shorty headers instead of long tubes?

Shorty huggers deliver most of the scavenging benefit in a package that clears steering shafts and frame rails, which matters in S10 swaps and narrow classic bays. Long tubes make more top-end but demand chassis clearancing.

For street trucks and tight engine rooms, the hugger style is the practical 350 short tube headers answer.

What does the EGR delete plate do on a TBI 350?

It seals the exhaust gas recirculation port on the intake manifold so hot, soot-heavy exhaust stops feeding back into the charge path. Intake air stays cooler and denser, carbon buildup stops, and EGR vacuum leaks disappear.

It is used in off-road and performance applications where the circuit is no longer wanted.

Will deleting the EGR throw a check engine light?

The block-off plate has to be paired with the matching simulator or ECU support, because the computer will set codes and turn on the check engine light the moment it stops seeing the EGR circuit working.

On these pre-OBD-II era trucks the monitoring is light, but plan the support so nothing chases a missing component.

How much power do shorty headers add to a 350 TBI?

Expect a solid mid-range torque gain and roughly 10 to 20 horsepower on a stock TBI 350, with more as intake and tuning work stack behind it. The underhood temperature drop is a bonus the wiring appreciates.

Pairing headers with the block-off plate and fresh gaskets is the classic budget small block chevy build order.

Are these parts street legal?

The headers and gasket hardware are street legal where local header rules permit. The EGR delete block-off plate is emissions delete hardware intended for competition and closed-course off-road use only, with the fitment table above confirming the TBI-era generation split.

Check your state and local rules before ordering the plate kit.

Do I need a tune after installing the kit?

The TBI computer adapts to headers reasonably well on its own, and most owners feel the gain without touching calibration. A chip or adjustables-rich ECM tune sharpens the fuel curve once the engine breathes freer.

If the EGR circuit is deleted, plan the simulator or ECU support in the same pass.

Are the headers stainless or coated?

The shorty huggers are T-304 stainless steel, which resists the corrosion that eats painted mild steel headers in salt states. No coating maintenance, just the raw oxidation resistance of the alloy.

Stainless takes on a light heat tint over time, which is normal and protective.

What is the warranty and return policy?

Every kit ships free from our US warehouses with a one-year warranty and a 45-day return policy. Our 24/7 support confirms fitment by VIN before you order.

Swap and race builders get the same coverage as daily drivers.