The Boostline Performance BL413JLTLB Street-Strip Series Iron 413 is built for customers who want serious Gen V LT performance without the cost of an aluminum block and aftermarket crank and rods. Using the incredibly stout L8T iron block as the foundation, this package delivers proven strength, long-term durability, and excellent value for street-strip builds.

Featuring a 4.125 in. bore and a 3.860 in. stroke, this combination is designed for efficiency, reliability, and budget-conscious power. The iron L8T block provides superior stability and is well suited for boosted or high-load applications, making it an ideal choice for customers who want dependable performance without stretching the budget.

This engine package maintains the same flexibility builders expect from the LT platform. It can be run on a Gen 4 ECM with port injection for straightforward swaps into older vehicles, while remaining fully compatible with direct injection for customers who choose to retain it. Note that the high-pressure fuel pump and direct injectors are not included and must be supplied by the customer.

Whether you're upgrading a workhorse truck, building a street-strip Silverado, or completing a cost-effective LT swap into a muscle car or hot rod, the Street-Strip Series Iron 413 offers durable construction, flexible fueling options, and real-world performance without the premium price of an aluminum block package.

Boostline Performance BL413JLTLB Specs:

• GM Gen V L8T Engine Block bored to 4.125 in.
• Blocks are CNC Decked, CNC Bored and CNC Torque Plate Honed and Align Honed
• L8T Center Counterweighted 3.860 in. Stroke Crankshaft
• L8T Rods with ARP bolts
• Forged 2618 Flat Top Pistons
• GM OEM Cylinder Heads for the larger diameter style LT Injectors
• Hydraulic Roller Camshaft:
  • Duration @ .050 in. 22x Intake/23x Exhaust
  • Lift: .61x Intake/.61x Exhaust
  • Note: Camshaft duration and lift values are shown with the final digit omitted to protect proprietary camshaft profiles. Boostline Performance uses lobe designs developed for this engine, and its intended performance range and operating characteristics
• LS7 Lifters and Trays
• HD timing chain
• VVT Limiter
• Pushrods, one-piece - hardened, 3/8 in.
• GM Rockers built with bronze bushing-style trunnion kits
• New Rocker Arm Bolts
• ACL Main & Rod Bearings
• Durabond Cam Bearings
• New block plug kit and barbell
• Chevrolet Performance High Volume Oil Pump
• ARP Main Studs
• ARP Head Studs
• Fel Pro Gaskets Throughout
• MLS head gaskets
• ICT Billet Valley Cover
• ICT Billet Injector Block off plates (used for shipping but can also be used when not utilizing the Direct Injection)
• ICT Billet LT-LS Valve Cover Adapters
• Boostline Valve Covers with coil mounts (coils not included)
• GM Truck style oil pan and pickup tube
• GM stock front cover
• GM stock rear seal housing

Boostline Performance BL413JLTLB Features:

• Fully assembled long block engine
• Includes cylinder heads and valvetrain components
• Professionally assembled for street and street-strip performance applications

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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