Re: Cross ram intakes
Generally, Long intake runner lengths (ie., cross ram) will work better on your large displacement engine and give better torque at low end. Larger tube diameter works better with large displacement engines at higher rpms. But a diameter too large may cause reversion and loss of power. Short intake runner lengths work better for increasing torque at lower rpms in smaller displacement engines. The smallest diameter without losing HP is the best size.
SL-C, MachineWorks LS7, Ricardo