4340 H Beam Rod

4340 Light Weight I Beam Rod

4340 Ultra Light Weight I Beam Rod

Our 306/331/347 Race 8 Second Dart Short Block is designed for 800hp-1200hp vehicles looking for a strong foundation for big horsepower. This shortblock is balanced to 28oz and ready for your big horsepower street or race car. The extra strength of this setup relies upon a 4340 forged steel crankshaft and set of 4340 forged steel H beam rods along with the Dart 4 bolt main 302 block. This is the premium 4 bolt iron block available for 302 based motors and can handle upwards of 1500hp. For lighter rotating assembly parts we also have high strength 4340 I beam rods, and Ultra light 4340 I beam rods for quick and high revving naturally aspirated engines. Don't hesitate to ask us about custom internal parts for your exact needs, wants, and application!

Block: .030 over TREperformance race prepped Dart 4 bolt main block

Crank: TREperformance forged steel 4340 3" crank for 306, 3.4" crankshaft for 347, 3.250" for 331 (balanced with the rest of the assembly to a 28oz imbalance)

Rods: TREperformance 4340 Forged H beam 5.09" for 306, 5.4" for 331, or 5.315" for 347

Bearings: Clevite P rod/main

Pistons: Probe SRS 2618-t6 high alloy lightweight forged pistons, Flat top (10.79:1 w/60cc), dish top (9.58:1 w/60cc), or blower dish top (9.01:1 w/60cc, 8.67:1 w/64cc), very light and strong for high boost or nitrous setups with large valve reliefs for healthy camshafts

Rings: Speed Pro high performance moly

306/331/347 Race 8 second Dart Short Block Options:

302 Based Short Blocks:

351 Based Short Blocks: