How big of a supercharger?

[masracingtd1167]

Just thinking out loud . How big of a blower would I need to make 300 more horsepower on my smallblock ?

[GlennLever]

Just thinking out loud . How big of a blower would I need to make 300 more horsepower on my smallblock ?

I'm not an expert, but I think it really depends on how hare you drive it rather than size.

[tylercrawford]

Just thinking out loud . How big of a blower would I need to make 300 more horsepower on my smallblock ?

71 series or a centrifugal?

[GlennLever]

Just thinking out loud . How big of a blower would I need to make 300 more horsepower on my smallblock ?

71 series or a centrifugal?

That would really depend on the rules of the association you are racing with and your personal taste.

There are nostalgic organizations that do not allow centrifugal blowers. They require a roots type blower. On top of that some require it to be a standard roots blower and do not allow high helix rotors. The NHRA Nostalgic rules stated that the first year, and than amended their rules to allow high helix rotors.

I don't think a centrifugal blower would look very good on a FED

[George]

Two of the group I run with are blown SBC. They both claim to make about 1200 hp. I am making 640 injected. I was told they started with 6-71s and went to 8-71s with better manifolds and really didn't see much difference. A 300hp goal should be an easy one to attain.

[masracingtd1167]

This would be a project for next year so I could run this 7.0 class . My car run's 7.0's with a 200 shot of nitrous so that's why I think 300 hp should do it

[George]

Nitrous not allowed ?

[wideopen231]

Bill

 With the new 6-71 like nostalgia guys run you should have no problem.I have heard that some are making 42 lbs with the 6's.I use to spin a 14-71 54% od and it was hi helix and thats about what we made. If your working with fuel system guy Im sure they can head you in right direction on OD and fuel system upgrades.