Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 383HT exhaust recommendatations
View Single Post
  #4 (permalink)  
Old 12-26-2012, 07:38 PM
ssmonty ssmonty is offline
Registered User
 
Last photo:
Join Date: Mar 2007
Location: Corinth, MS
Posts: 629
Wiki Edits: 0

Thanks: 0
Thanked 33 Times in 31 Posts
If it were mine and I absolutely had to use cast manifolds, I'd make some type of step-up adapter from 2" to at least 2-1/2" as near the manifolds as possible(even if it just were welding larger pipes onto smaller pipes, say welding 2-1/4" dia. two inches long onto 2"pipe connected to manifold, then welding 2-1/2" pipe onto the 2-1/4" "adapters" kind of like stepped headers).
Then you could use 2-1/2" exhausts/mufflers for more flow. Even if the exhaust is coming out of the restricked manifolds small dia. opening, it will still expand enough to make use of the larger exhaust/mufflers for more power/torque and reduce backpressure IMO.
Someone probably makes an adapter for this already, and have for many years, expanded pipe or whatever, but I don't know the details. Google it.
Overlook the spelling.
FWIW
ssmonty
PS I know you said in another post that you had tried different types of headers. Did you ever try Tri-Y's instead of 4 into 1 types? These Thorleys have a 2-1/2" collector.
Attached Thumbnails
Click image for larger version

Name:	375Yinfr.jpg
Views:	61
Size:	542.8 KB
ID:	70101  

Last edited by ssmonty; 12-26-2012 at 07:51 PM.
Reply With Quote