Dart Machinery, LTD. stands behind each product we manufacture 100%. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible.

Warning This product contains chemicals known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov
Big M Aluminum

Big M Aluminum



Designed to be the strongest, most durable and easiest to build Aluminum big block available. The ultimate choice for competition engines.

Based on the Chevrolet big block V8 design, these Aluminum blocks feature extra strengthening in critical areas, increased displacement capacity, true priority main oiling and precision CNC machining.

Conventional configuration that retains all production dimensions for compatibility with standard components. Advanced engineering makes Dart Aluminum big blocks the choice for serious competition.


• Standard 9.800” or 10.200” tall deck heights available for stroker engines.

• 4.250”, 4.500” or 4.600” bore sizes standard.

• Ductile Iron sleeves with extra thick cylinder walls promote excellent ring seal.

• Reinforcing ribs strengthen the lifter valley and bell housing flange.

• Inboard valley head stud bosses improve head gasket sealing.

• Priority main oiling system delivers oil directly to the crankshaft bearings to enhance reliability at high engine speeds.

• Steel 4-Bolt main caps or Ductile Iron and optional Aluminum caps. Splayed outer bolts for extra strength.

• Dual oil pan bolt patterns fit standard and notched oil pans.

• Parts kit included (PN 32000006).

Big M – Aluminum

31274344 – Ductile Std. Std.   9.800 4.250

31274354 – Ductile Std. Std. 10.200 4.250

31274444 – Ductile Std. Std.   9.800 4.500

31274454 – Ductile Std. Std. 10.200 4.500

31274644 – Ductile Std. Std.   9.800 4.600

31274654 – Ductile Std. Std 10.200 4.600

31264344 – Steel Std. Std.   9.800 4.250

31264354 – Steel Std. Std. 10.200 4.250

31264444 – Steel Std. Std.   9.800 4.500

31264454 – Steel Std. Std. 10.200 4.500

31264644 – Steel Std. Std.   9.800 4.600

31264654 – Steel Std. Std. 10.200 4.600

BBC ALUMINUM Block Information Packet – B23