Headers on a BBC 454
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
Likes: 144
From: Van Alstyne, TX
Headers on a BBC 454
So I had bought a set of long tube headers from headmann, and decided this weekend was the time to put them on since I got my welder to work. So the real question is, what kind of performance can I expect from swapping out the old exhaust manifolds? 20 hp? 15 hp?
I know that the 454s of the 70s (mine is a 1973) were pretty much choked to death. Do you think I can feel any noticeable improvement?
I know that the 454s of the 70s (mine is a 1973) were pretty much choked to death. Do you think I can feel any noticeable improvement?
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
From manifolds to headers, you should easily see 15-20 hp with quicker throttle response at higher rpm.
If it's a low compression smog motor, don't expect to much on the low rpm side. Just to give you a heads up
If it's a low compression smog motor, don't expect to much on the low rpm side. Just to give you a heads up
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
Likes: 144
From: Van Alstyne, TX
I really have my expectations at zero. Low compression is what killed these motors. and mine is no exception. Hopefully it breathes better considering my old manifolds were leaking where they met the exhaust pipe!
Burning Brakes
Joined: Nov 2011
Posts: 1,170
Likes: 201
From: Willoughby Ohio
Headers are huge on a big block,I have seen claims of more than 50 hp on a decent build.The sound is amazing also.
