What mods to do to a set of Mac headers??
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 122
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From: Itasca, IL
What mods to do to a set of Mac headers?? I'm getting a set of used Macs (finally!) and I know alot of guys do some tweaking to them, what should I do before putting them on the car?
(these will be with the ORP)
(these will be with the ORP)
TECH Enthusiast
Joined: Nov 2001
Posts: 712
Likes: 1
From: Dallas,Texas
Re: What mods to do to a set of Mac headers?? Here is an old thread that I saved.. about
a mod on MAC's
http://ls1info.com/article.php?sid=108
Do the AIR Restrictor Mod as well..
a mod on MAC's
http://ls1info.com/article.php?sid=108
Do the AIR Restrictor Mod as well..
TECH Apprentice
Joined: Nov 2001
Posts: 329
Likes: 0
From: SoFla
Re: What mods to do to a set of Mac headers?? Based on what I've read, you can port & smooth out the ports on each primary tube. I've heard they may have some metal in there that hinders flow. I guess a good port match would help.
Oh, and Jet Hot coat them! I had a MAC y-pipe on my 94 Z and the coating was ok but if I did it again, I'd go Jet Hot.
Good luck!
Oh, and Jet Hot coat them! I had a MAC y-pipe on my 94 Z and the coating was ok but if I did it again, I'd go Jet Hot.
Good luck!
Re: What mods to do to a set of Mac headers?? [quote]Originally posted by DRGnFLYZ28:
<strong>Based on what I've read, you can port & smooth out the ports on each primary tube. I've heard they may have some metal in there that hinders flow. I guess a good port match would help.
</strong><hr></blockquote>
How much does this porting cost? Im thinking about getting this done on mine...anyone know?
<strong>Based on what I've read, you can port & smooth out the ports on each primary tube. I've heard they may have some metal in there that hinders flow. I guess a good port match would help.
</strong><hr></blockquote>
How much does this porting cost? Im thinking about getting this done on mine...anyone know?
Re: What mods to do to a set of Mac headers?? I ported my set for the 01' basicaly took out most of the inner weld on the primaries. It was pretty sloppy. I don't know what differnece it made, but I am sure it was worth something. Some people modify them to eliminate the air tubes. And alot of people are making their own custom 3" y pipe.
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TECH Senior Member
Joined: Nov 2001
Posts: 10,341
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Re: What mods to do to a set of Mac headers?? Install bullets in the Ypipe. You can also expand the collectors or cut them off, extend the collector a little and put in a 3 inch collector. That has picked up 6 or so RWHP on the dyno I think.
Chris
Chris
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TECH Junkie
Joined: Nov 2001
Posts: 3,604
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From: Los Angeles
Re: What mods to do to a set of Mac headers?? Ported before/after:
http://jmx.car-audio.net/car/macs.jpg
http://jmx.car-audio.net/car/macs.jpg
