Our Hotrod series engines are the perfect choice for someone building a custom hotrod, old muscle car, or replacing that tired old factory engine in your late model GM vehicle.


 We have used our Hotrod 5.3L longblock in mild 400whp NA setups or in boosted setups up to the 700whp mark with the optional ARP head stud upgrade.  


Hot Rod Series 5.3L LS Longblock


Bore: 3.800"

Stroke: 3.622"

Connecting Rod Length: 6.089"

Displacement: 5.3L / 328c.i.

Piston Volume: 0.00cc Flat tops with no valve reliefs

Compression Ratio:
10.5 with 61cc(862/706 Gen 3)

10:1 with 64.5cc(243/799 Gen 4)


Horsepower Rating: Up to 700whp on Boost with the ARP Headstud option

Horsepower Output: Up to 425whp Naturally Aspirated


Engine Block: Reconditioned OEM Gen 3 or 4 5.3 Iron or Aluminum Block

Crankshaft: Reconditioned Gen 3 24x or Gen 4 58x OEM Crankshaft

Pistons: Hypereutectic with hard anodized crown and coated skirts.

Connecting Rods: Reconditioned Gen 4 OEM connecting rods.

Main Fasteners: New GM Main Bolts

Main Bearings: King XP-Series Race Bearings

Rod Bearings: King XP-Series Race Bearings

Cam Bearings: Durabond one piece bearings


Cylinder Heads:

Gen 3 CNC Ported 862/706 Reconditioned Heads

Gen 4 CNC Ported 243/799 Reconditioned Heads


Valves: Reconditioned Stock Valves w/ multi angle valve job

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

Camshaft: Application Specific Spec'd Camshaft

Timing Chain: GM HD Timing Chain

Lifters: OE Replacement LS7 Lifters

Push Rods: 5/16 Diameter Chromoly Pushrods

Rocker Arms: Reconditioned Rocker Arms w/ trunnion upgrade

Head Fasteners: GM Head Bolts or Optional ARP Head Studs

Head Gaskets: GM MLS Head Gaskets

Oil Pump: Melling High Pressure Oil Pump


HotRod 5.3L (LS) Longblock

  • Gen 3: Uses a 24x reluctor wheel crankshaft and a Gen 3 configuration 5.3 block with the knock sensors in the valley. The Gen 3 configurations come with CNC ported 862 or 706 casting heads.


    Gen 4: Uses a 58x reluctor wheel crankshaft and a Gen 4 configuration 5.3 block with the knock sensors on the side of the block. The Gen 4 configurations come with CNC ported 243 or 799 casting heads.