Overview
Brand: ATK High Performance Engines
Manufacturer’s Part Number: SP40-G4
Part Type: Short Block Engines
Product Line: ATK High Performance Chevy LS 408 Short Blocks
Summit Racing Part Number: HPE-SP40-G4
UPC: 653517518355
Crate Engine Family: Chevy LS
Actual Engine Displacement: 6.7L/408
Rear Main Seal Style: 1-piece
Crankshaft Material: Forged 4340 steel
Piston Material: Forged aluminum
Short Block Piston Style: Dish
Connecting Rod Material: Forged 4340 steel
Connecting Rod Beam Style: H-beam
Engine Block Material: Cast iron
Main Bolt Style: 6-bolt
Main Journal Type: Chevy LS
Deck Height (in.): 9.240 in.
Engine Balance: Internal
Oil Pan Included: No
Timing Cover Included: No
Harmonic Balancer Included: No
Flexplate Included: No
Flywheel Included: No
Assembled: Yes
Remanufactured: Yes
Quantity: Sold individually.
Notes: GM 6.0L Gen IV block with 4.030 in. bore and 4.000 in. stroke, -29cc dished pistons and 24 tooth reluctor. Naturally aspirated applications. Includes Manley forged 6.125 in. H-Beam connecting rods, upgraded ARP main studs, and ARP 8740 rod bolts.
ATK High Performance Chevy LS 408 Short Blocks
These ATK High Performance Chevy LS 408 short blocks are made to handle some serious power. The foundation of any high performance engine is a rock-solid short block, so ATK designed and developed these to be just that. They feature a fully forged, balanced, and blueprinted rotating assembly that is available in a variety of configurations to fit naturally aspirated, nitrous, and forced induction builds, as well as those with 24 and 58-tooth cranks.
These ATK High Performance Chevy LS 408 short blocks include the following:
* GM LS Iron blocks
* Aligned and hone main bores
* Manley 4340 forged crankshaft
* 4.00 in. stroke
* Manley 4340 H-beam connecting rods
* Manley forged pistons
Applications
Make: CHEVROLET
Engine Type: V8
Engine Size: 6.7L/408
Engine Family: Chevy small block Gen III/IV (LS-based engines)
Application Notes: GM 6.0L Gen IV block with 4.030 in. bore and 4.000 in. stroke, -29cc dished pistons and 24 tooth reluctor. Naturally aspirated applications. Includes Manley forged 6.125 in. H-Beam connecting rods, upgraded ARP main studs, and ARP 8740 rod bolts.
