Split exhaust manifold question
Junior User
Joined: Apr 2002
Posts: 68
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Split exhaust manifold question
Hi all, great site!!!
I have reading up on the split exhaust a little bit..I notice a few times the word "port them out" as been mentionned,
I just purchase a new set of split manifolds and wondering how can I port them out/what do I use?...Thanks for any help!!!!!!
Steve
I have reading up on the split exhaust a little bit..I notice a few times the word "port them out" as been mentionned,
I just purchase a new set of split manifolds and wondering how can I port them out/what do I use?...Thanks for any help!!!!!!
Steve
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
Split exhaust manifold question
[updated:LAST EDITED ON 10-Jan-03 AT 02:06 PM (EST)]Welcome to the forums! 
Porting the split manifolds can be done with a dremel esque tool with a die grinding attachment. or just a die grinder itself.
while' you've got the exaust manifolds off, i would port the head some too, so that it doesn't have that much of a thermactor hump in the exhaust port and allows it to breathe a little easier.
Thats the problem with the big six, it doesn't breathe very well. if you've also got the intake off, i'd port it and the intake ports some too. just don't go crazy with porting.
Hope this helps ya!
Porting the split manifolds can be done with a dremel esque tool with a die grinding attachment. or just a die grinder itself.
while' you've got the exaust manifolds off, i would port the head some too, so that it doesn't have that much of a thermactor hump in the exhaust port and allows it to breathe a little easier.
Thats the problem with the big six, it doesn't breathe very well. if you've also got the intake off, i'd port it and the intake ports some too. just don't go crazy with porting.
Hope this helps ya!
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Split exhaust manifold question
But don't port the head while it is on the engine. Actually, all you can do with the valves in place is gasket match. To properly port and polish the head, you need to remove the valves, and then have the seats and valves cut. It may surprise the machine shop guys a little to see a ported 300-6 head.
Jared
Jared
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