[Zooguy]

All right so I have a 1966 Pontiac Star Chief executive that will be getting a Roots blower. This is not going to be a race car it is just going to be a fun spirited cruiser. Being that it will see lots of Miles I'm assuming bigger is better so I'm looking for an 871 Roots blower to go on the vehicle so I don't have to spin it as fast as a 671 to get the desired boost levels. I'm wanting to create just enough boost to overcome the parasitic losses from the blower. Again this is a cruiser not a race car!!!

So here's where I need some help it would be easiest to use the motor that's already in the car it has a 389 with a two barrel carburetor. However I'm learning not all 389s were created equal. I could be mistaken but I've been told my motor has 10.5 to 1 compression which isn't ideal for boosted applications but if I keep good fuel in it I'm sure it would be okay.

I would prefer to use the 389 because it's already in the car. I also have a mark 4 big block Chevy torn apart in the garage that would be perfect for a boosted application. But that would make a lot more work to keep power steering air conditioning etc.