Old worn out blower vs brand new stripped Littlefield

I've updated my blower. My Mooneyham had been maintained but wasn't ever restripped. It was very loose. At 25 over it would make 16-17#s max.
My new Littlefield is nice & tight (brand new). On my old combo, about 10% over was 14#s. I'm thinking starting this blower at 1:1 or even a few under to get the feel of it.
Is there a general consensus on how much a new blower pics up?
Mathmatically, 1:1 should be 14psi or so (387" sbc)

This is a 7.60 index car, blown alcohol FED.

 

Both are hi helix ? Is the new Littlefield an LB22 ?

 

BOth are std helix.

Littlefield is a competition blower, not an LB.

 

Don't know what you mean by that. The LB22 Littlefield is their best competition blower.

 

They have a series called "competition". It's not a retro (LB) it is a standard helix, cast case stripped 671

 

Perfect for your application.

 

I had a 362ci sbc LF 6-71 made 25 psi 30 OD its was maxed out

 

Ended up 10 under, making 14# of boost, running the same numbers as 26 over.