174/177 supercharged small block, where to start?

The 6-71 blowers take about 75HP to turn at 6000RPMs.
The B+M 144, 162s take 25 to 30HP to turn at the same RPMs.

If your running 6PSI of boost, the B+M will have moree RWHP due to less parasitic drag and frictional losses.

These are Roots blowers and make HP/TQ instantly.
The B+M does provide alittle more TQ in the low RPM band over a 6-71.
In your case of a mildly built 318, the B+M will out perform the 71 series blowers.

The centrifugal superchargers are more efficiant than any Roots blower.


But nothing says, "Look at me!", like a 6-71 poking out of the hood.