Mustang Tri-Y's on 351W?

[JeffBoudah]

I know i'm a scarce member here, but i'm getting serious about my build now, so i figure it'd be beneficial to hang around box central more.

I found these at a garage sale, paid $100, basically an impulse buy... Worth it if i can make them fit, if it's too much work, I'll flip just them on CL or Ebay.

So... my question, how much hacking will be needed? I know mid-length will fit with some massaging... why not these?

They are Doug's D669Y-R1 headers. They are built for a 67-70 Mustang.

[johnunit]

Just eyeballing it, the angle looks wrong. I think they don't exit low enough.

[sly]

+1 looks like it would bury the collector in the firewall just above the frame.

[JeffBoudah]

Here they are next to some shorties for scale.

[Bobcat]

Yeah, I'd agree with them. They would basially be exiting into the floor boards. Theoretically you'd have to cut your floors open to have them virtually empty into the cabin. So.. No go.

Though, I'm putting those same 5.0 fox shorties on my 351 and currently have them on the 302 in the car. They fit perfectly.

[JeffBoudah]

Maybe I can get the ole heat wrench on the two tubes in between the Y's and bend them down a bit??? hum... that'd take a leap of faith, since they'd no longer hold much value after that.

[johnunit]

the more I look at it, that rear pipe is just going the wrong way. Mustang shorties already get pretty close to the firewall. Right after the initial turn, it needs to go down at more of an angle, like the mustang shorties do.

If you were willing to cut and weld all 8 pipes to tweak the angle, it might work. Whether that's significantly easier than building from scratch is debatable.

[turbo2256b]

Many Mustang headers are not designed to be used with automatic transmissions

[JeffBoudah]

These will clear a c4, which i have in my 79'

[pantera77]

I wager it would be a lot of modding to make them fit.

[JeffBoudah]

I will mock them up in a few months when i pull the 302 and drop in the 351. Worst case, I can make $150 on them. they are $450+ new...

[packman]

JeffBoudah: Those were the headers that I was seriously looking into. I have the same concerns as well with the exit. Hopefully they fall short of hitting the firewall. Then I would get a 3" 90* or 45* (depending on where they end up) piping and go from there. If those Dougs don't work, I was going to go with the Anderson Motorsports 1-3/4" shorties.

Packman

[starkophile]

Yeah, I'd agree with them. They would basially be exiting into the floor boards. Theoretically you'd have to cut your floors open to have them virtually empty into the cabin. So.. No go.

Though, I'm putting those same 5.0 fox shorties on my 351 and currently have them on the 302 in the car. They fit perfectly.

I'm fairly confident they won't work on a 351, which is why there is a 351 swap header.
I had a set of both and tried to bolt the 351 shorties on the 302 and the angle of the passenger side collector was pointed right at the starter

[sly]

I think they would work with some wedge shaped pipe welded in incremental sizes in the port tubes to lengthen the rear one about an inch and fill the gap on the front one made from that angle change and then fill the gaps on the middle two to change the angle of decent to clear the firewall if not just changing the bend in all the tubes in front of the collector to achieve the same result.