LT/L83 BoostPrep 5.3L Longblock


Bore: 3.800"

Stroke: 3.622"

Connecting Rod Length: 6.125"

Displacement: 5.3L / 328c.i.

Piston Volume: -1.6cc or -9.5cc dish with valve reliefs

Compression Ratio:

10.8:1 with -1.6cc dish pistons

9.8:1 with -9.5cc dish pistons


Horsepower Rating: Up to 1100whp


Engine Block: Reconditioned OEM L83 5.3L Aluminum Block

Crankshaft: Reconditioned OEM L83 5.3 Crankshaft

Pistons: Diamond Racing Forged Pistons

Connecting Rods: Callies Compstar H-Beam Connecting rods w/ ARP rod bolts

Main Fasteners: ARP Main Studs

Main Bearings: King XP-Series Race Bearings

Rod Bearings: King XP-Series Race Bearings

Cam Bearings: Durabond one piece bearings


Cylinder Heads: CNC Ported Reconditioned L83 Cylinder Heads

Valves: 1.928" intake / 1.556" exhaust

Valve Springs: .660" Lift Dual Valve Springs w/ Titanium retainers

Camshaft: Application Specific Spec'd Camshaft

Timing Chain: Katech C5-R Timing Chain

Lifters: OE Replacement LS7 Lifters

Push Rods: 3/8 Diameter Chromoly Pushrods

Rocker Arms: Reconditioned Rocker Arms w/ trunnion upgrade

Head Fasteners: ARP Head Studs

Head Gaskets: GM MLS Head Gaskets

Oil Pump: OEM GM Oil Pump


BoostPrep L83 5.3L Longblock (Gen.V LT)