Dart SBC Little M Iron Block 9.025 4.000/350 31181111LT

If you're building a serious Small Block Chevy engine from the ground up, you need a foundation that won't compromise your power goals. The Dart SBC Little M Iron Block delivers the strength, precision, and flexibility required for high-horsepower applications—whether you're chasing track records or pushing limits on the dyno. This bare block gives you complete control over your build, starting with a rock-solid casting designed to handle forced induction, nitrous, and sustained high RPM operation.

The Little M design combines proven durability with modern engineering. The 4.000-inch bore accommodates larger displacement without sacrificing cylinder wall thickness, while the 9.025-inch deck height optimizes combustion chamber geometry and allows for taller piston speeds. Four-bolt main caps secure the crankshaft with industrial-grade rigidity, and the 2-piece rear main seal eliminates common leak points that plague budget builds. Cast iron construction means thermal stability and longevity—this block won't warp under sustained racing conditions.

Technical Specifications:

• Small Block Chevy compatible
• 4.000-inch bore
• 9.025-inch deck height
• 350 cubic inch displacement
• 4-bolt main caps
• 2-piece rear main seal
• Cast iron construction
• Bare block—no internals
• MPN: 31181111LT
• Sold individually