TSP Iron 383 LS Long Block

The TSP Iron 383 LS Long Block is a proven high-performance foundation designed to deliver exceptional power and reliability. Built in-house by Texas Speed, this long block includes our forged 383 short block base paired with Brawler LS6 Cylinder Heads, Johnson Lifters, and the legendary TSP Tsunami Camshaft. Ideal for naturally aspirated applications, this setup offers crisp throttle response and the durability expected from a TSP-built engine.

Included Components

TSP 4340 Forged 4.000” Crankshaft – Precision-balanced for strength and smooth operation.
TSP Forged H-Beam Connecting Rods – Engineered for maximum durability in high-stress conditions.
Wiseco -3cc Forged Pistons – Produces an 11.2–11.3:1 compression ratio for strong naturally aspirated performance.
TSP Brawler LS6 CNC-Ported Cylinder Heads – Premium cathedral-port heads offering excellent airflow and velocity.
TSP Tsunami Camshaft – 235/240 duration, .629"/.615" lift, 111 LSA for a wide powerband and aggressive sound.
Johnson Hydraulic Lifters – Proven reliability and performance for street or race use.
JP Performance Timing Set – High-quality timing assembly ensuring precise valve timing and durability.
GM Head Bolts – OEM-style fasteners for proper sealing and torque retention.

Performance Specifications

Displacement: 383 cubic inches (6.3L)
Compression Ratio: 11.2–11.3:1
Block Type: Gen IV LS Iron Block
Crank Reluctor Wheel: 58x
Bottom-End Strength: 1000 HP Capable

Additional Details

Includes 12 Quarts of TSP Break-In Oil for initial startup and break-in.
Camshaft is degreed in-house to ensure proper valve timing.
Cylinder heads, cam, lifters, and timing set preinstalled — ready for your intake, front cover, and accessories.
58x reluctor wheel included. For 24x applications, use Lingenfelter Conversion Box #L460065397.
In stock and ready to ship — built, balanced, and blueprinted by Texas Speed.