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TSP 387/388 C.I.D. LSx Long-Block

From Original price was: $16,404.39.Current price is: $16,076.30.

ADD 6–8 WEEK LEAD TIME TO ALL LSX/DART BASED BUILDS DUE TO BLOCK AVAILABILITY!!! The Texas Speed & Performance 387/388 C.I.D. LSx Long-Block is built using a brand-new GMPP LSx cast iron block with a factory 3.622″…

Build your assembly Pick each component — the price updates as you choose.
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Description

TSP 387/388 C.I.D. LSx Long-Block

ADD 6–8 WEEK LEAD TIME TO ALL LSX/DART BASED BUILDS DUE TO BLOCK AVAILABILITY!!!

The Texas Speed & Performance 387/388 C.I.D. LSx Long-Block is built using a brand-new GMPP LSx cast iron block with a factory 3.622″ stroke crankshaft and your choice of 24X or 58X reluctor. This package provides a strong, complete foundation for high-performance street or race builds.

Key Features:

  • New GMPP LSx cast iron block
  • Factory GM 3.622″ stroke crankshaft
  • 387 CID uses 4.125″ bore pistons / 388 CID uses 4.130″ bore
  • Choice of Wiseco or Diamond Racing pistons
  • Oil and coolant plugs pre-installed

Options & Notes:

  • Optional LS1 conversion package available
  • Upgrade to 1/2″ ARP head studs requires PRC aftermarket cylinder heads
  • Custom rotating assembly and build options available

All TSP engines include 12 quarts of break-in oil at no additional cost for proper startup protection and ring seal.

Note: Wiseco pistons support LS1/LS2/LS6/L92/LS3 and most aftermarket heads, while Diamond pistons are intended for LS1/LS2/LS6 applications. Contact Texas Speed for an itemized quote.

This assembly is built to order. Choose your crankshaft, connecting rods and pistons above — the price updates as you select.

Additional information

Weight 7088 oz

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Everything to first start

What this engine needs on day one

Build the full combo around it →
Break-in oilDriven BR30 Conv 5W-30 Break-In Oil, Quart 12 Count Case

High-zinc oil for the first 500 miles. A case covers the fill plus the first change.

Stand-alone harnessLSA, LS9, LS2, LS3 LS Swap Stand Alone Engine Harness For E67 ECU

58x harness so the engine runs in any chassis. We confirm transmission and throttle with you.