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ATK SP31G4 LS 408 Stroker Short Block 18cc Dish Pistons 58 Tooth

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#35020104

ATK SP31G4 LS 408 Stroker Short Block 18cc Dish Pistons 58 Tooth

408ci LS short block with 18cc dished pistons
Forged rotating assembly built for high horsepower use
Designed for 58-tooth reluctor wheel compatibility

Type:

18cc Dish

10cc Dish 10cc Dish (Boost/NOS Ready)18cc Dish (Boost/NOS Ready)4cc Flat Top 4cc Flat Top (Boost/NOS Ready)29cc Dish 29cc Dish (Boost/NOS Ready)

$5,239.00

/each

Factory Shipped

Quantity

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Product Summary

Short Block Crate Engine Type, No Value Camshaft Type

408ci LS short block with 18cc dished pistons
Forged rotating assembly built for high horsepower use
Designed for 58-tooth reluctor wheel compatibility
Built for NA, turbo, or nitrous applications
Perfect short block for street/strip LS builds

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Key Specs

Crate Engine Type	Short Block
Engine Displacement	408 cu. in.
Piston Material	Forged Aluminum
Crankshaft Material	Forged 4340 Steel
Carburetor Included	No

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Need To Know

Made to Order

This custom item will ship when completed

Truck Shipment

Truck shipments must be pre-paid with a credit card, certified check or money order

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ATK Engines SP31-G4 Details

Engine Specifications:

Block: Seasoned 6.0L Iron Gen IV

Bore/Stroke: 4.030” x 4.000”

Displacement (cu.in): 408

Crankshaft: Manley 4340 forged 58 tooth reluctor wheel

Rods: Manley 4340 forged H beam 6.125” ARP 8740 bolts

Pistons: Manley 2618 forged -18cc dished moly skirt coated

Rings: Plasmamoly

Compression Ratios: 64cc = 10.2:1 / 68cc = 9.9:1 / 72cc = 9.5:1 (can vary due to deck height/gasket thickness)

Camshaft Bearings: Installed and Clocked to OEM Position

Freeze Plugs: Installed and Sealed

Oil Galley Plugs: Installed and Sealed

Recommended Components:

Balancer- Internal balance

Flex plate/ Flywheel- Internal balance

Head Gasket: .051” or per application

Oil Pump: Melling #10295 with high pressure spring

Engine Info:

Oil: 10W40 Non synthetic for first 3000 miles

Oil Filter: Wix or K and N per application

Disclaimer: The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you’re not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.

Guides & Documents

Warranty (ATK Engines)

Technical Information (ATK Engines)

CARB Warning

Follow EPA, CARB, and state regulations for engine changes

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine

WARNING:

Cancer and Reproductive Harm – www.P65Warnings.ca.gov

CARB warning

ATK Engines SP31-G4 Specifications

KEY SPECS
MFG. Part #	SP31-G4
Brand	ATK Engines
Crate Engine Type	Short Block
Engine Displacement	408 cu. in.
Piston Material	Forged Aluminum
Crankshaft Material	Forged 4340 Steel
Carburetor Included	No
Intake Manifold Included	No
Distributor Included	No
Connecting Rod Material	Forged 4340 Steel
Valve Covers Included	No
Cylinder Heads Included	No
Throttle Body Included	No
Timing Cover Included	No
Oil Pan Included	No
Water Pump Included	No
Harmonic Balancer Included	No
Flexplate Included	No
Flywheel Included	No
Air Cleaner Included	No
Spark Plugs Included	No
Spark Plug Wires Included	No
Computer Included	No
Wiring Harness Included	No
Reluctor Wheel	58x

GENERAL
Combustion Chamber Volume	64cc
Bore x Stroke (in)	4.030" x 4.00"
Assembled	Yes
Material Type	Cast Iron
Notes	GM 6.0L Gen IV block with 4.030 in. bore and 4.000 in. stroke, -18cc dished pistons and 58 tooth reluctor. Naturally aspirated applications. Includes Manley forged 6.125 in. H-Beam connecting rods, upgraded ARP main studs, and ARP 8740 rod bolts.
Sold in Quantity	Each
Connecting Rod Beam Style	H-Beam
Piston Style	Dish

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