TTI vs. Dougs headers

[496coronet]

Good evening! I'm hoping to get some help from the forum to decide if TTI's or Doug's headers would be the better choice for my '67 Coronet. The set that fits with zero clearance issues is what I'm after. Engine is a low-deck with stock cast-iron heads. Power steering and power brakes. 4-speed with the factory bell and big-*** 143-tooth flywheel. Might save a couple of nickels and dimes with Doug's, but not really a factor. For those that like part numbers (myself included) the choice is either TTI 383440-134 ceramic coated or Doug's D451 in stainless. ANY and all comments appreciated!!

 

[coloradodave]

I had TTIs and changed them out for Dougs due to the better sparkplug clearance and less interference with the torsion bars and starter. With the TTIs I had to fab 1/4" thick spacers for the motor mounts in order to raise the headers above the pitman arm. Brand new mounts and flat zerk fittings. Both headers are excellent products. 3/8" flanges, heavy wall tubing and good finishing. You make your choice, but be aware that headers are known to need a little massaging for some car models. Just a part of "hot rodding"..
BTW, I recently changed out the Dougs for the Schumaker Creative Services Tri-Y headers. Great starter servicing, excellent spark plug clearance and no "adjustments" to the tubes. Lost some horsepower; gained some serviceability. At the point the tires break loose on the street the extra horsepower isn't missed...

 

[493 Mike]

I've tried both and had to modify the TTI's. The Dougs fit fine although I had the RB style engine. I liked the nickel-plated finish, it colored up with a rainbow of colors after curing.
Mike

 

[gkent]

I have Dougs D452's on an RB. Stainless weren't available when I bought them nor would I buy stainless anyway. Stainless does not like heat and gets brittle. My fear is they would have a shorter life span than the ceramic coated.

Mine fit fine with a mini starter and manual steering and brakes. Had a clearance issue at the Lakewood bellhousing but because I did a trial fit before the engine went in I ground the clearance in the bell instead of dinging up the headers.

 

[khryslerkid]

If you have the 452 heads they have a ridge that will interfere with the header flange. Quick fix is to grind/taper the header flange before installation. I like the Doug's headers.

 

[Darter6]

Just a part of "hot rodding"..

Well said ! No 2 Mopars are the same

 

[icetech]

If you have the 452 heads they have a ridge that will interfere with the header flange. Quick fix is to grind/taper the header flange before installation. I like the Doug's headers.
View attachment 1968842

View attachment 1968843

That would suck to find after it was all together

 

[TN Mopar]

I love my Dougs
They fit perfectly and have held up well with no leak issues
66 Dodge Charger with a 440

One note though, I have Edelbrock RPM heads with angled plugs. I use a DEI boot sleeve and have had zero melted boots or wires
The ceramic finish has held up well

 

[Frankb]

I have TTI on two cars. 68 Charger, 69 GTX. Both fit excellent.

 

[493 Mike]

That would suck to find after it was all together

I got around the flange interference issue in 1975 on my new 440 3/4-ton 4-wheel drive P/U by adding an extra gasket.
Mike

 

[496coronet]

I love my Dougs
They fit perfectly and have held up well with no leak issues
66 Dodge Charger with a 440

Thanks to all for chiming in!
TN Mopar, I'm curious if you're running PS in your '66 Charger?

 

[LSS&B]

If you have the 452 heads they have a ridge that will interfere with the header flange. Quick fix is to grind/taper the header flange before installation. I like the Doug's headers.
View attachment 1968842

View attachment 1968843

Did you use Doug's D452 headers on your 452 heads?
Did you test fit with engine on stand?
Need to check if my 1967 915 heads have that flange
Thanks

 

[TN Mopar]

Thanks to all for chiming in!
TN Mopar, I'm curious if you're running PS in your '66 Charger?

yes I am

 

[khryslerkid]

Did you use Doug's D452 headers on your 452 heads?
Did you test fit with engine on stand?
Need to check if my 1967 915 heads have that flange
Thanks

Yes, on a 440. Mocking them up with the engine in the car I noticed the ridge causing a gap.

I got around the flange interference issue in 1975 on my new 440 3/4-ton 4-wheel drive P/U by adding an extra gasket.
Mike

I thought of using two gaskets also at the time.

Thanks to all for chiming in!
TN Mopar, I'm curious if you're running PS in your '66 Charger?

I installed power steering a few years after installing the Doug's headers on my 440. With standard steering it was a breeze. Once I installed the power steering gear box it was a totally different instalation. Jacking up the driver's side of the engine was required. I would think TTIs would be the same. The passenger side was easier jacking that side of the engine up also. You having a Low Block it might not be necessary.