2bbl to 4bbl what kind of power increase

rumblefish360 said
OK, gotcha. The inprovemnt isn't to bad. It helps, but it's not a big gain.
Of course, theres allways that great sound with a 4bbl.......LOL!

I guess, 15 HP?

I agree, maybe 20-25?

Increase will probably be in higher end of RPM, but at higher RPM the manifolds and stock cam will start to limit the gains.