400m Tri-Y Headers
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New User
Joined: Mar 2006
Posts: 7
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From: Seattle-area
400m Tri-Y Headers
I have a 77 F-250 Hi-Boy with a 400M powerplant and am looking for tri-y headers for my truck. I've contacted Doug Thorley and Dynomax and neither of them make a tri-y style header for my truck. Does anyone out there know where I can get a set of these headers?
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Welcome to the site 
Did you check the Hooker & Hedman sites for an application ?
You could also do a search for *400 headers*
By the way, Drop the M off the 400M you typed.
The M goes after 351M in the 351M/400 Engine series.
Did you check the Hooker & Hedman sites for an application ?
You could also do a search for *400 headers*
By the way, Drop the M off the 400M you typed.
The M goes after 351M in the 351M/400 Engine series.
Tuned
Joined: Nov 2004
Posts: 338
Likes: 0
thats a hard application to find, they only used the 400 in the highboy for the 77's, i have a 77 hb w/ 400 also. i looked at a few places for headers also, i didnt see any tri-Ys available, but i didnt call around, just looked on-line. i have some #'s for hooker and hedman headers that are supposed to fit, but they arent tri-Ys. If you really want tri-Ys you might have to have them custom made.
