Which 351 headers etc?
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they dont all fit, I know the headman for a 69-70 work I tried hooker comp and super comp on my 67 and they did not fit but I do have twisted wedge heads, The best header I have found is a 13/4 " 3/4 length dougs try y-s I have them on my 408 in my 67 vert and they fit like a glove.
my 67 htwheelz's photos- powered by SmugMug
my 67 htwheelz's photos- powered by SmugMug
Rusty67
Dirt-Old 20+Year Member
You can't get a set of headers custom made for 600 bux, the raw materials are just too expensive these days. The flanges alone are like 250 bux.
Check with Dougs headers.
Edit:
351w and 289/302 heads have the same bolt patern so a 289/302 header should fit just fine. The only issue might be with the angle that the collector pipe comes in at, you might have to heat it and bend it out so it doesn't run into the trans.
What type of trans do you have ? Autos are actually easier in this case because you don't have to deal with the clutch linkage.
Check with Dougs headers.
Edit:
351w and 289/302 heads have the same bolt patern so a 289/302 header should fit just fine. The only issue might be with the angle that the collector pipe comes in at, you might have to heat it and bend it out so it doesn't run into the trans.
What type of trans do you have ? Autos are actually easier in this case because you don't have to deal with the clutch linkage.
Well, 65-66 require special 351 headers due to the narrower engine compartment. I prefer to cut a stock H-pipe, rather than use the typical "header" H-pipe, you wind up doing more work with them than the stock ones.
Are header for a 351 not bigger in the primaries? As well as the h-pipe?
its a T5 with stock linkage
Rusty67
Dirt-Old 20+Year Member
You should be able to fit some good Tri-Ys on there.
The primary tubes may be a different size, they may not. Depends on the headers you use.
If you don't care about having headers then use a set of 69 or 70 351w manifolds and have them ported. They will flow just as good as headers.
The primary tubes may be a different size, they may not. Depends on the headers you use.
If you don't care about having headers then use a set of 69 or 70 351w manifolds and have them ported. They will flow just as good as headers.
SadbutTrue
Founding Member
Heddman makes swap headers for 351w equipped 65/66 with 1 5/8" primaries (for mild engines), and Hooker makes Super Comps for them as well (if you've got a more serious build). The Heddmans are cheap... less than $150 shipped. The super comps are pricier but very nice.
Rusty67
Dirt-Old 20+Year Member
I may have a spare set of unported manifolds. I can check with weekend if you like.
The Tri-Ys are out there.
Dougs are among the best you can get if you want a true header and they do make one to fit yer application I believe.
What year is your Mustang BTW ?
The Tri-Ys are out there.
Dougs are among the best you can get if you want a true header and they do make one to fit yer application I believe.
What year is your Mustang BTW ?
SadbutTrue
Founding Member
I don't think Tri-Ys will work on a 65/66.
I'd just go with the Hooker Super Comps. Great brand, great performance, shouldn't have any fit issues, godo quality. Not cheap but not particulary ridiculous either (~$300 iirc).
Rusty67
Dirt-Old 20+Year Member
The 69 and 70 351w manifolds when properly ported will out flow a large variety of headers.
They are however, heavier.
SadbutTrue
Founding Member
IMO the porting only really would seem to have utility in applications where stock appearance is desired or where money is really, really at a premium. Before they had 65-66 swap headers, porting the stock manifolds (or modifying other headers) was your only option... so I would have understood.
The Heddman Hedders run about $150 new. They're not the greatest pieces but they work fine. Now, if 6-10 hrs of grinding and dremel work is worth $150 (and I realize to some that it is), the porting might be attractive. But IMO, it wasn't.
Rusty... you've always been a strong advocate of porting the stockers. Any links/articles that show they can actually flow like a decent set of headers?
I would think that the near 90 degree angles alone would prevent even an optimally ported stock exhaust manifold from coming near most headers. On my old stock 351w manifolds, the gas would come out of the port, be angled straight down then have to get swept away at 90 degrees to the rear... even if you widen the pipe thats far from an optimal flowpath (two near 90 degree bends).
Also... I seem to remember people saying K-code exhaust manifolds are noticeably better flow-wise. Might be worth picking up a set of those instead of stock 351w manifolds if that is the case and you decide on that route.
The Heddman Hedders run about $150 new. They're not the greatest pieces but they work fine. Now, if 6-10 hrs of grinding and dremel work is worth $150 (and I realize to some that it is), the porting might be attractive. But IMO, it wasn't.
Rusty... you've always been a strong advocate of porting the stockers. Any links/articles that show they can actually flow like a decent set of headers?
I would think that the near 90 degree angles alone would prevent even an optimally ported stock exhaust manifold from coming near most headers. On my old stock 351w manifolds, the gas would come out of the port, be angled straight down then have to get swept away at 90 degrees to the rear... even if you widen the pipe thats far from an optimal flowpath (two near 90 degree bends).
Also... I seem to remember people saying K-code exhaust manifolds are noticeably better flow-wise. Might be worth picking up a set of those instead of stock 351w manifolds if that is the case and you decide on that route.
Rusty67
Dirt-Old 20+Year Member
No articles on that, just friends that use to race all the time. Not all manifolds can be ported out to flow well but some can. You can pay someone to port them out properly and it isn't that expensive. If headers are 600 bux it can be worth it. If you can buy even crappy headers for 150 that will fit well then the price point may not justify the work.
