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6.1 headers on 5.7l D port to Square port

6K views 15 replies 7 participants last post by  concussion 
#1 ·
So I tried searching but came up with nothin so here's my question, I'm in the process of changing out headers. My 5.7 manifolds are square port and the 6.1s I have are D-port. Is that right? Do I have the wrong 6.1 headers? They look like they should work but just making sure itll be ok or I bought the wrong ones.
 
#3 ·
Thank you very much sir. I was scared I bought the wrong ones.
 
#4 · (Edited)
They will work, but any part of the flange that shields / blocks the ports will be altering (negatively) rate-of-flow.
 
#6 · (Edited)
Headers are superior to be sure; given the cost it would be prudent to get the most outta them...which is not much to begin with :^)
 
#8 ·
Wait - are these actual long tube D-port headers or OEM 6.1 manifolds?
 
#9 ·
Oem 6.1s. Are all year oem 6.1 headers the same or did they change before going to the 6.4?
 
#10 · (Edited)
Same throughout. Disregard my comment about scavenging...the OEM headers do squat in this regard...they are not really actual headers :^)
 
#14 ·
For the work being performed, length is far more important than diameter :^)
 
#15 ·
That's what she said, but he's talking car stuff :)-

I might just put that quote in my signature, gotta be best this year!

Sent from my SCH-I405 using Tapatalk 2
 
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