Engines and Components› Engines, Blocks and Components

Dart

LS 427 FORGED H-BEAM 4.125 FLAT-TOP

$11,888.68

SKU: D00Q 03424272FT

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

Simplify engine building and save time with these assembled short blocks. Dart's professional assemblers start with their own SHP (Special High Performance) cast iron blocks and custom fit them with internally balanced rotating assemblies. All new quality performance parts including forged 4340 steel rods, forged pistons with floating pins, Clevite bearings, and Hastings moly rings. To finish these off, we suggest using Dart's matched Top End Kits. No warranty expressed or implied. Note: May ship from Michigan.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandDart
Part NumberD00Q 03424272FT

Videos

Dart Offers Pre-Assembled Short-Blocks for DIY Builders!

Dart Offers Pre-Assembled Short-Blocks for DIY Builders!
A Look Inside Dart's SHP Sportsman Line of Parts

A Look Inside Dart's SHP Sportsman Line of Parts
Dart University, Prepping Blocks

Dart University, Prepping Blocks
Dart GM LS Block Comparison

Dart GM LS Block Comparison
Ls Dart block vs LS2 block

Ls Dart block vs LS2 block
Inside Dart’s LS Next Iron Block: Choosing the Right Block for Your Next Build

Inside Dart’s LS Next Iron Block: Choosing the Right Block for Your Next Build
Jeff's Single Turbo 427ci LS

Jeff's Single Turbo 427ci LS
Building a 1,300hp LS Short Block - Easy Horsepower

Building a 1,300hp LS Short Block - Easy Horsepower

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy