Dual Header Exhaust

Dual Header Exhaust

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How Much horsepower Can I expect to gain on a Chevy 250 from 4 barrel intake and dual exhaust headers?

I have a chevy 250 inline and was wondering what kind of gains in horsepower I should expect. The 250 is from a 72 Chevelle.and is rated at 150 horsepower stock. I have seen a claim stating 40 Hp from the 4 barrel intake alone.What can I truly expect? Is that number reasonable?

What about if I use a two barrel carburetor?
I already Purchased Ceramic Coated headers and an aluminum intake I was at the Hershey PA Swap meet and got both for only $200 total.So Don't base decisions on that.

OK so i ran your current engine in an engine builder that i have and i came back with a baseline of 153 hp at 4000rpm and 237 ft lb of torque at3000 rpm. when i run it again with a 600cfm (1406) edelbrock, and a dual plane high flow intake. something like an edelbrock performer you come up with 160hp at 4000rmp and 244ft lb of torque at 3000rpm. so just 7hp with a lot of money spent. the dual exhaust makes very little difference on small displacement engine. on the flip side of all this a good cam would make the most bang for your buck. i was able to get it up to 265 at 3500 rpm with just a cam replacement and stock everything else. if you need to want more info and help planning your build just let me know.

oh and to people who always say to junk it and get a 350 you are ignorant. i can build just as much hp out of this guys 250 as most of you can do on a 350 and ill do it with machine work. planning your build and matching the right parts makes all the difference.