10hp
yes
bout 10 to 25. depending on what size of motor
adding headers will allow engine to breath better and boost up horsepower but not by much, headers also make you vehicle louder with pipes.
20-25 as a rule of thumb. More with good heads.
if you can find the hp. of the eng., you can add between 12-20 more hp. for the headers.
Not enough to even notice.
Start with a cold air intake, then add headers. If you want 100 or more horsepower instantly add nitrous
There are too many variables that determine what hp increase headers will give. Engine size, carbed,f.i.,stock,hi perforforman ce,car weight,the list goes on and on....
carb, cam, intake, headers, heads, msd igntion, or a 350
You would probably only get 5-10hp at the crank from installing both, depending on brand and other modifications.
It's all about the combination, so it's impossible to answer the question. However, it's reasonable to say that the overbore should produce at least 2 or 3 horsepower, the headers could add 10 horsepower, the intake, 5-10 horsepower, and the heads could add anywhere from 10-100 horsepower.