The Boostline Performance BL327JSB street series 5.7 short block is the logical next step up for any vehicle that originally came with a 5.3 LS. We utilize the same 5.3 core and bore the block to 3.898 in. and use a forged flat top LS1 piston. Taking the bore from 3.780 in. to 3.898 in. really wakes up the platform. This short block is a good choice to replace or upgrade that tired stock 5.3 in your ride. Whether you are wanting stock idle for momma's grocery getter or some nasty chop for the hot rod, this long block build can get you there on a budget.

Boostline Performance BL327JSB Specs:

• GM Iron 5.3 Block
• GM Stock 5.3 Crank
• GM Gen IV Stock Rods with ARP Rod Bolts
• Forged Flat Top Pistons
• Performance Ductile Moly Rings set: 1.5, 1.5, 3mm
• Clevite Main & Rod Bearings
• Durabond Cam Bearings
• ARP Main Studs
• New block plug kit and barbell

Boostline Performance BL327JSB Features:

• Professionally assembled engine built by Boostline Performance
• Precision-machined block and performance rotating assembly
• Designed 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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