The Boostline Performance BL383JLB Street-Strip Series 383 long block is not to be confused with the ole, ever popular 383's of the past. This modernized 383 will blow the minds of some old timers that like to reminisce about the old days and their mouse motor strokers. We take a standard 5.3 truck motor and transform it into a very capable package. Whether you want the fastest Silverado in your neck of the woods or looking to power that muscle car undertaking an LS swap, this is a package worth considering.

Plan to clear 600HP NA with the right cam and intake selection! This package is still dependable at the 1000HP mark if you want to put a little extra squeeze on it with your choice of power adder.

Boostline Performance BL383JLB Specs:

• GM Iron 5.3 Block
• Blocks are CNC Decked, CNC Bored and CNC Torque Plate Honed and Align Honed
• Boostline Center Counterweighted Forged 4 in. Stroke Crank
• Forged 6.125 in. H-Beam Rods with ARP bolts
• Forged 2618 Flat Top Pistons
• Hydraulic Roller Camshaft:
  • Duration @ .050 in. 22x Intake/23x Exhaust
  • Lift: .59x Intake/.59x 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
• Single roller Billet Gear, performance, timing chain & gear set
• Billet timing chain dampener, also added to all gen3 builds
• Pushrods, one-piece - hardened, 3/8 in.
• GM Rockers built with bronze bushing-style trunnion kits
• New Rocker Arm Bolts
• Aluminum 210cc LS1 Cylinder Heads
• ACL Main & Rod Bearings
• Durabond Cam Bearings
• New block plug kit and barbell
• Melling High Volume Oil Pump
• ARP Main Studs
• ARP Head Studs
• Fel Pro Gaskets Throughout
• BTR small bore LS9 head gaskets - 3.950 in. bore
• Boostline Valve Covers with coil mounts
• GM muscle car oil pan and pickup tube
• GM stock front cover
• GM stock rear seal housing

Boostline Performance BL383JLB 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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