How much HP does open headers add?
Open headers may increase your horsepower ratings by a big margin – about 30-40 horsepower, depending on the displacement of the engine. Especially if it’s a big block. Open headers will also make your car extra loud, and you may not be able to talk with your friend that is sitting next to you.
Can you run a car with just headers?
Very few vehicles can get around state dB and emissions regulations, but the few that can are most often large trucks. So, even if your truck was built after 1971 you can still legally run open headers as long as it didn’t originally come with a catalytic converter.
How much torque does shorty headers add?
See all 16 photos Run on the dyno, the shorty headers duplicated the power output of the stock manifolds with peaks of 404 hp and 413 lb-ft of torque.
How much horsepower do cold air intakes add?
That’s why a cold air intake is a small investment with a rather big payoff. It makes such a big difference, in fact, that the simple process of redirecting the filter to draw cooler air is good for a horsepower gain of about 5 to 20 ponies in most cars.
What kind of piston does the 351M use?
However, there are a couple of other much less expensive options available for both the 351M and the 400. 351M –The only production high CR piston for the 351M is the TRW 8.6 to 1 CR piston (P/N L2466F). This is a flat top forged aluminum piston that is available in both standard and 0.030″ sizes.
Are there different cylinder heads for 351M 400?
Since the 351M/400 engines are in the 335 engine series, every single cylinder head from any engine in the 355 family will all interchange with these engines. That leaves at least 6 distinctly different types of cylinder heads that will work on the 78 & 79 351M/400.
Do you need to change the heads on a 351C?
The 71-74 351C 4V heads, like the 2V heads, will not give your engine enough increase in CR to warrant changing your heads. However, the 70-71 CJ (Cobra Jet) 4V heads will give your engine a considerable increase in CR. Unfortunately, the 351C 4V heads are not a good choice for a low RPM truck engine.
What does open headers mean on a 2000 Trans Am?
midnight blue. 2000 trans am. Open headers means their is no exhaust coming off the headers, no y or x pipe, which means its running with no cats or muffler. And some will argue that you will loose power because of no backpressure in your exhaust, others will say that you dont which is true I honestly dont know.