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Dart LS Next Cast Iron Bare Blocks 31837121 SHP Pro block,SBC Ir/Blk LSNext SHP 9.240-4.000-LS Main w/steel cap

SKU: DRT31837121

Engines, Bare Blocks

Dart LS Next Cast Iron Bare Blocks 31837121 SHP Pro block,SBC Ir/Blk LSNext SHP 9.240-4.000-LS Main w/steel cap

SKU: DRT31837121

Engines, Bare Blocks
A$11,218.24
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.
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Description

Dart LS Next cast iron bare blocks integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. The blocks are designed to rectify some of the former LS's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for Gen III and IV platforms. They're available in multiple engine block styles, including stock/OEM standard deck and aftermarket. Dart LS Next blocks are back and better than ever!

Highlight features of the LS Next cast iron bare blocks include:

* Cast with premium cast iron alloy
* Conventional style 4-bolt steel main caps
* Full main webbing for maximum bottom-end strength
* Extended cylinder barrels at the bottom to provide greater piston support for all combinations
* Extra-thick Siamese cylinder bores
* Blind head bolt holes don't go through into the water jacket
* Provision for oil restrictors in the lifter valley
* Revised low-restriction priority main oiling system
* Pro-Stock/Pro-Mod big block style stepped main oil galley
* External oil filter (must be used with stock or aftermarket oil pumps)
* Dual starter mounts
* Expanded water jacket on #1 cylinder for additional cooling capacity
* LSX-style lifter bosses and dog bone provision are provided

Part Type

Engines, Bare Blocks

Data: v4.2 - Upd: 2026-09-27 17:52:30

Specifications

Product Attributes - Brand
Dart
Product Attributes - Manufacturer's Part Number
31837121
Product Attributes - Part Type
Engines, Bare Blocks
Product Attributes - Product Line
Dart LS Next Cast Iron Bare Blocks
Product Attributes - UPC
807051015751
Product Attributes - Main Journal Type
Chevy LS
Product Attributes - Engine Block Material
Cast iron
Product Attributes - Engine Block Style
Aftermarket
Product Attributes - Engine Block Deck Height
Standard deck
Product Attributes - Deck Height (in.)
9.450 in.
Product Attributes - Cylinder Bore as Shipped
4.000 in.
Product Attributes - Camshaft Location
Standard
Product Attributes - Main Bolt Style
4-bolt
Product Attributes - Main Caps Included
Yes
Product Attributes - Main Cap Material
Steel
Product Attributes - Main Cap Fasteners Included
Yes
Product Attributes - Main Bearings Included
No
Product Attributes - Rear Main Seal Style
1-piece
Product Attributes - Finished Cylinder Bores
No
Product Attributes - Raised Cam Location
No
Product Attributes - Cam Bearings Included
No
Product Attributes - Freeze Plugs Included
No
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold individually.
Product Attributes - Special Attention
Lifter bore is 0.842 in. diameter. Freeze plugs required are press-in type.

Reference Information

Brand Name/s Dart
StreetFX SKU drt31837121
SFX Item ID 5089708
Supplier Item Code 5089708
Manufacturer SKU 31837121
Manufacturer UPC 807051015751
Alternative References 9.240-4.000-LS

Compatibility

Application Data
  • MakeCHEVROLET
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)

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