TSP 383 C.I.D. LS1/LS6 Balanced Rotating Assembly

TSP 383 C.I.D. LS1/LS6 Rotating Assembly

Texas Speed & Performance rotating assemblies offer the best durability with the best pricing available! You can choose from a variety of upgrades for the crankshaft, connecting rods, and pistons! FYI, All Wiseco piston sets will come standard with their steel top/napier 2nd ring set! Bearings are not included in the base price but can be added to your rotating assembly package. Give us a call, and we will be happy to spec out a rotating assembly that will match your needs!

Picture is a representation, actual item may vary.

Piston Specifications

• Piston Top: Available in dished, flat-top, or small-dome options (choose based on target compression and fuel).
• Approximate Compression Ratios (with 64cc chambers):
  • Dished: ~10.3–10.7:1
  • Flat-Top: ~11.2–11.6:1
  • Small Dome: ~12.0–12.5:1

  *For exact compression, use a compression calculator for precise adjustments.*

• Engine Compatibility: GM Gen III LS1/LS6 5.7L blocks with cathedral-port heads; 24x or 58x reluctor options available depending on crank selection.
• Engine Sizes Supported: 383 C.I.D. (6.3L) stroker from LS1/LS6 platforms.

Technical Details

• Cylinder Bore Size: 3.898″–3.910″ (common overbores: 3.905″, 3.910″)
• Ring Groove Width: Varies by piston; Wiseco sets include steel top with Napier 2nd ring (common ring packs: 1.2/1.5/3.0mm).
• Compression Height: ~1.110″ (varies by piston design)
• Pin Diameter: 0.927″ (LS standard)
• Connecting Rod Length: 6.125″ H-beam/I-beam options
• Crankshaft Stroke: 4.000″ (383 stroker)
• TDC Assembly Height: Targets OEM LS deck height of ~9.240″ (final deck clearance depends on block and gasket selection)

Performance & Compatibility

This TSP 383 rotating assembly is engineered to deliver strong mid-range torque and excellent top-end power, ideal for street/strip builds, boosted combinations, or all-motor setups. Choose from premium forged cranks, 6.125″ rods, and performance pistons to tailor the assembly to your fuel type and power goals. Balancing services, bearings, and reluctor options can be added to match your ECU and intended use. Designed for LS1/LS6 blocks with appropriate machine work and clearancing where required.