| Re: [GMCnet] Weekend DIY Header [message #162345] |
Tue, 06 March 2012 13:01  |
Richard Brown
Messages: 281
Registered: May 2009
Karma: 1
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Senior Member |
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I have a question. I noticed a set of headers online while looking up a set for a neighbor of mine for a Mustang that were called "Tri-Y". They were a 4-2-1 style header for tight spaces. Not real sure how they work, but I have been told that they di work better than stock. Has anyone researched wheather that style of header would work for a GMC? Seems to me that if someone could come up with something that could be installed without the need to re-do the headpipes too much would be a good thing. Sort of a direct replacement for cast iron manifolds. Just wondering if this has been tried or not...
Richard & Carol Brown
1974 Eleganza SE
"DILLIGAF"
Lindale, Tx. 75771
903-881-0192
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Richard & Carol Brown
1974 Eleganza SE
1174 Hickory Hills Dr.
Murchison, TX. 75778
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| Re: [GMCnet] Weekend DIY Header [message #162348 is a reply to message #162345] |
Tue, 06 March 2012 16:32  |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Hi Richard:
The Doug Thorley header that Applied GMC sells is a tri-Y header. As you saw in your research, Tri-Y headers are good for lower RPM applications. As each pulse of exhaust flow goes through a leg of the Y, it creates a slight vacuum in the other leg. The timing or pairing of the Ys is important to the flow gains.
Edited a few mins later:
The final collector on the headers line up with the mufflers eliminating the need for the head pipe. I just installed a set and really happy with the result (I have not uploaded pictures just yet)
Best regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
[Updated on: Tue, 06 March 2012 16:36] Report message to a moderator |
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