Is it worth it to install LT headers from MACs?
Is it worth it to install LT headers from MACs? Right now I have all the boltons plus a TRex cam. I am going to be installing a set of ported heads and a FAST 90mm intake and TB in the near future. Would I see significant gains switching to LT headers. I realize that most of you will say yes, but I dont know anyone that has MACs that is disapointed, and many of them are making decent power. So would it be worth the swap?
From what I remember reading, you may or may not gain much peak hp, but you will gain about 10rwhp or so under the curve, which is pretty decent.
I'd do it. Besides, after getting everything done and you don't swap to LT's, you'll always wonder...what if?
Gary
I'd do it. Besides, after getting everything done and you don't swap to LT's, you'll always wonder...what if?
Gary
i put on MAC ceramic coateds and ory today and love it to death....all you will give up to the lt's is a little torque on the bottom end due to not having a collector like the lt's do
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Originally Posted by gillbot
I spin mine to 6800 and my dyno graph kept climbing to almost 6500 with MAC headers. I don't see how they run out of breath at 6000?
the only down side i would say is the are really close too steering shaft that combined with loose engine mount =headers hitting shaft. Secondly they dont just slide in you might have to coerce them a little. Oh and you might need new air tubes if the headers are for 98-02,I had to go to GM and get A.I.R tubes from a 98 model year, if you do get new ones get them for 01-02 specific
Upside they work really well i notice huge difference in accel, in ground clearence, thier catted cermaic Y bolts on which makes it nice. besure to use the stock steel LS1 gaskets all others dont even match the ports. Plug changes are easier too.
Upside they work really well i notice huge difference in accel, in ground clearence, thier catted cermaic Y bolts on which makes it nice. besure to use the stock steel LS1 gaskets all others dont even match the ports. Plug changes are easier too.
Originally Posted by 8GTOKLR
the only down side i would say is the are really close too steering shaft that combined with loose engine mount =headers hitting shaft. Secondly they dont just slide in you might have to coerce them a little. Oh and you might need new air tubes if the headers are for 98-02,I had to go to GM and get A.I.R tubes from a 98 model year, if you do get new ones get them for 01-02 specific
Upside they work really well i notice huge difference in accel, in ground clearence, thier catted cermaic Y bolts on which makes it nice. besure to use the stock steel LS1 gaskets all others dont even match the ports. Plug changes are easier too.
Upside they work really well i notice huge difference in accel, in ground clearence, thier catted cermaic Y bolts on which makes it nice. besure to use the stock steel LS1 gaskets all others dont even match the ports. Plug changes are easier too.
Originally Posted by Frosty
People still have the idea that anything aside from LT's=junk.
I gained 5 hp peak but with a little better curve with the Edelbrock lt's with the merge collector over the macs . The longtubes with the stepped design gave me a better deeper sound though. Not to bad though considering I sold my macs for 300 and only paid 450 for the Edelbrocks and y pipe .
Originally Posted by gillbot
I spin mine to 6800 and my dyno graph kept climbing to almost 6500 with MAC headers. I don't see how they run out of breath at 6000?
If you "port" the tubes and do the collector mod there are certainly not going to run out of breath.
Ben T.
Originally Posted by gillbot
this can happen with any brand of header though, LT or not.
You have no idea how many PM's i got after I posted the dyno graph of my car. Seems most dont want to or refuse to believe you can make good power with MAC headers.
You have no idea how many PM's i got after I posted the dyno graph of my car. Seems most dont want to or refuse to believe you can make good power with MAC headers.
Makes me feel better about mine.Gillbot, what did you open the tubes up with? Just a carbide burr?
Ben T.
Originally Posted by Studytime
They don't. In theory a shorter tube will scavange best as RPM rises. This is similar to longer tubes scavaging better at lower RPM (which is why they make more torque).
If you "port" the tubes and do the collector mod there are certainly not going to run out of breath.
Ben T.
If you "port" the tubes and do the collector mod there are certainly not going to run out of breath.
Ben T.
I dont know either. I figure if hes running a big cam and fast intake why not get better headers?
Originally Posted by Studytime
Yeah, PREDATOR-Z has macs on his 370ci iron motor. Makes me feel better about mine.
Gillbot, what did you open the tubes up with? Just a carbide burr?
Ben T.
Makes me feel better about mine.Gillbot, what did you open the tubes up with? Just a carbide burr?
Ben T.
I understand that people think the 2.5" Y is a restriction but running an open exhaust on that 2.5" Y will flow PLENTY of power IMHO. For me specifically though, I got the MACs because I like their fitment alot better than the LT's. Granted, I may give up MAYBE 5HP but I can live with that so I don't scrape on pebbles in the road.
