Street. Track. Everything between.
Your garage Find parts for your vehicle Select year, make and model to narrow your search.

Dart Race Series Big Block Chevy Aluminum Bare Blocks 31264345 Engine Block, Cast Iron, 4-Bolt Mains, 4.250 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Block, Each

SKU: DRT31264345

Engines, Bare Blocks

Dart Race Series Big Block Chevy Aluminum Bare Blocks 31264345 Engine Block, Cast Iron, 4-Bolt Mains, 4.250 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Block, Each

SKU: DRT31264345

Engines, Bare Blocks
A$15,317.95
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
View cart
We accept
American Express
Mastercard
Visa
PayPal Checkout
Direct Deposit
Afterpay
Apple Pay
Google Pay
Zip Pay

Description

What makes the Dart Race Series big block Chevy aluminum bare blocks the top choice for serious competition engines? They're based on the Chevrolet big block V8 design, but with added features and Dart's implemented advanced engineering!

Key features of these Dart Race Series blocks include:

* Cast from virgin 355-T61 aerospace alloy for strength
* Ductile iron sleeves with extra thick cylinder walls promote excellent ring seal
* Reinforcing ribs strengthen the lifter valley bellhousing flange
* Inboard valley head stud bosses improve gasket sealing
* Priority main oiling system delivers oil directly to the crankshaft bearings to enhance reliability at high engine speeds
* Standard BBC cam journals, up to 60mm with raised cam options available
* Standard .842 in. BBC lifter bores, other options available
* Available with or without distributor provision
* Steel 4-bolt main caps with splayed outer bolts for extra strength (light-weight aluminum caps also available)
* Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in chassis
* Dual oil pan bolt patterns fit standard and notched oil pans

Part Type

Engines, Bare Blocks

Data: v4.2 - Upd: 2026-10-14 09:09:00

Specifications

Product Attributes - Brand
Dart
Product Attributes - Manufacturer's Part Number
31264345
Product Attributes - Part Type
Engines, Bare Blocks
Product Attributes - Product Line
Dart Race Series Big Block Chevy Aluminum Bare Blocks
Product Attributes - UPC
807051017144
Product Attributes - Main Journal Type
Chevy 454
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.)
9.800 in.
Product Attributes - Cylinder Bore as Shipped
4.240 in.
Product Attributes - Cylinder Bore Diameter
4.250 in.
Product Attributes - Maximum Bore Diameter (in.)
4.600
Product Attributes - Camshaft Location
Standard
Product Attributes - Engine Block Weight (lbs.)
285 lbs.
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
2-piece
Product Attributes - Finished Cylinder Bores
No
Product Attributes - Raised Cam Location
Yes
Product Attributes - Cam Bearings Included
No
Product Attributes - Freeze Plugs Included
Yes
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold individually.
Product Attributes - Notes
Block bores are .10 undersized to allow for piston set up.

Reference Information

Brand Name/s Dart
StreetFX SKU drt31264345
SFX Item ID 5089045
Supplier Item Code 5089045
Manufacturer SKU 31264345
Manufacturer UPC 807051017144
Alternative References 4-Bolt, 2-Piece

Compatibility

Application Data
  • MakeCHEVROLET
    Engine TypeV8
    Engine FamilyChevy big block Mark IV

Loading compatibility information...