Re: Big bore

Posted by Fred Puhn On 2013/5/11 16:15:30

A blower will not only effectively increase the displacement but it will also somewhat overcome the poor breathing of a flathead engine. If you do it use a positive displacement blower like a Rootes. You get a lot of low end boost and there is no lag like you get with a turbo. 5 psi boost is easy, but I would shoot for something more like 7 psi to ovecome the power consumed by the blower drive. You may want to use high octane fuel if you use a blower. 7 psi is a half atmosphere boost so it will increase the power and torque by 40% or so without revving the engine any higher than stock.