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Topic: mac headers (Read 975 times) previous topic - next topic

mac headers

Anyone have any fitment problems with unequal length mac shorties? how close are they to the stock engine mounts?

Thanks in advance
88 sport,TW heads, comp xe270hr, cobra u/Tmoss ported lower, 65 mm throttle body, under drives,smog delete,
1.7 roller rockers, cai, k&n, bbk adj regulator, 76mm Pro-m,all MSD ign. MSD dist,18° base timing, 3g alt.1 5/8 ceramic headers, 255lph walbro, 2.5" h-pipe, flowmasters, silverfox valvebody, 3.73 gear,
http://i216.photobucket.com/albums/cc154/flipnbird/DSCF0185.jpg ( RIP : ( )

mac headers

Reply #1 –
These is on my Coupe but I thought it to be relevant.  I had a set and they lasted for about four years and then I started having gasket issues.  They would blow out between the head and the header .  I went through all kings of  trying to keep them sealed up.  Pulled them off and they were warped so I chucked them in the recycle bin and installed some BBK shorties.  They have been on the car for over seven years and no issues what so ever.  The  from the header to the head is much thicker than the MAC units were and the quality was a bit better IMO.

Darren

83 351W TKO'd T-Bird on the bottle


93 331 Mustang Coupe - 368 rwhp

mac headers

Reply #2 –
From what I've heard MAC headers are just bad. They tend to warp because they don't have a  that links all of the tubes together...
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

mac headers

Reply #3 –
Its been a few years since I had them and thunderjet302 is 100% correct.  I had gladly forgotten about how they lacked a one piece .  It took a small pry bar to get the tubes to line up so you could bolt them up to the head towards the end of their lives.  I think I just relived a nightmare...those things sucked.  The BBK headers I have now are one piece and I have had no leaks.

Darren

83 351W TKO'd T-Bird on the bottle


93 331 Mustang Coupe - 368 rwhp

mac headers

Reply #4 –
Quote from: Aerocoupe;336262
Its been a few years since I had them and thunderjet302 is 100% correct. I had gladly forgotten about how they lacked a one piece . It took a small pry bar to get the tubes to line up so you could bolt them up to the head towards the end of their lives. I think I just relived a nightmare...those things sucked. The BBK headers I have now are one piece and I have had no leaks.
 
Darren

I had that same issue. Fit great at first, but got worse with each removal/installation. I cross-threaded many a header bolt with those bad boys, attempting to pry them back to their original locations.
 
If you must have a set, I recommend getting studs. They made life worth living after fooling around with those headers...
2005 Subaru WRX STi|daily driver
 

mac headers

Reply #5 –
Thanks guys, I am now convinced NOT to get them!!....... they were a fairly good deal but I am going to pass.
88 sport,TW heads, comp xe270hr, cobra u/Tmoss ported lower, 65 mm throttle body, under drives,smog delete,
1.7 roller rockers, cai, k&n, bbk adj regulator, 76mm Pro-m,all MSD ign. MSD dist,18° base timing, 3g alt.1 5/8 ceramic headers, 255lph walbro, 2.5" h-pipe, flowmasters, silverfox valvebody, 3.73 gear,
http://i216.photobucket.com/albums/cc154/flipnbird/DSCF0185.jpg ( RIP : ( )