The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise. The main difference is that there is an open area under the plenum chamber. Product Line: MidRise Air.
Chevy SBC 350 5140 Forged Steel Crankshaft ST-3.480 M-350 RJ-2.1 RMS-1Pc Bal-Int
Chevy SBC 350 4340 Forged Steel Crankshaft ST-4.000 M-350 RJ-2.1 RMS-2Pc Bal-Int
Chevy SBC 350 4340 Forged Steel Crankshaft ST-3.750 M-350 RJ-2.1 RMS-1Pc Bal-Int
Chevy SBC 350 4340 Forged Steel Crankshaft ST-3.750 M-350 RJ-2.1 RMS-2Pc Bal-Int
