[shommel]

if i put headers on my 65 mustang will it gain horsepower?if so how much?

[stang93mustang]

Originally Posted by shommel

if i put headers on my 65 mustang will it gain horsepower?if so how much?

It will gain HP and Torque. How much depends on the type of headers and the mods all ready on the motor. Headers are a good buy for the money for bolt ons.

[2Manystangs]

some...not much maybe 10...for the hassle and noise they make I'd stay stock, if you have a 289 a set of the old hi-po cast iron manifolds are best...a full exhaust, long tube headers, h-pipe and hi flow mufflers might net you 20-25 hp, depends on engine and mods

[2Manystangs]

I recall my old Stangs really could have used better rear gears, the stockers are so bad it kills all performance...get some 3.55s or lower...

[PaulS]

Headers in combination with a larger carb, better intake and a cam to match it all will add some real HP. By themselves on a stock engine they will only be one step towards more power and the net yield will be low - maybe 10 hp and may require an increase in jet size by one or two sizes. A good distributor tune is more likely to give you more power and economy than headers if you are only going to do one thing.