Headers tube size?

[ratvon]

I'm thinking of buying TTIS headers for my 68 340 barracuda Streetcar should I spend the extra money and get a set of inch and seven eighths tubes so later on down the road if I want to put some nice heads on it I will be able to or just stick with the inch and 5/8?

 

[roccodart440]

I'd go 1.875

 

[Cudafever]

I don't know your combo but 1.875 headers you can grow into for for sure.

 

[Locomotion]

The TTI 1 5/8"-1 3/4" step headers should be considered similar to 1 3/4" headers. Personally I believe they work even better than straight 1 3/4". They do leave a lot to "grow into". The 1 5/8" just leaving the ports helps maintain velocity and torque while the step up helps overall. I've been 11.14 @ 117+ with a normally aspirated 360, as-cast Indy LA-X heads, .474" hydraulic cam & 10.5 compression at 3,540lbs. It's usually better to be a little conservative, especially if it's a dual-purpose car. But if you build it up enough all-around, 1 7/8 may help more.

This test is on a mild 300HP 360, but I'm sure that the TTI step difference over straight 1 5/8" or 1 3/4" headers would be even more with a stronger combo.
Dyno chart is shown at the end of the 2nd set of pics in the article. (2nd link)

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine

 

[ratvon]

The

The TTI 1 5/8"-1 3/4" step headers should be considered similar to 1 3/4" headers. Personally I believe they work even better than straight 1 3/4". They do leave a lot to "grow into". The 1 5/8" just leaving the ports helps maintain velocity and torque while the step up helps overall. I've been 11.14 @ 117+ with a normally aspirated 360, as-cast Indy LA-X heads, .474" hydraulic cam & 10.5 compression at 3,540lbs. It's usually better to be a little conservative, especially if it's a dual-purpose car. But if you build it up enough all-around, 1 7/8 may help more.

This test is on a mild 300HP 360, but I'm sure that the TTI step difference over straight 1 5/8" or 1 3/4" headers would be even more with a stronger combo.
Dyno chart is shown at the end of the 2nd set of pics in the article.

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine

Res

 

[ratvon]

Well I've been reading some interesting information online and it seems that if you go to big it will actually defeat the purpose of exhausting gasses but I'm going to keep reading .I'm putting a motor in with j heads but with x head size valves and I know later on I going to put some really good heads on. the reason I'm not doing it now because I'm shelling out thousands to get this car back on the road since the70s and will upgrade to better heads later

 

[yellow rose]

Well I've been reading some interesting information online and it seems that if you go to big it will actually defeat the purpose of exhausting gasses but I'm going to keep reading .I'm putting a motor in with j heads but with x head size valves and I know later on I going to put some really good heads on. the reason I'm not doing it now because I'm shelling out thousands to get this car back on the road since the70s and will upgrade to better heads later

The better the head (exhaust port) the smaller the header can be, within limits. Also, when guys are running 1.625 tubes on 800 HP stuff, they have more money in Dyno testing than most guys have in their entire car. They specifically develop exhaust lobes and spend big $$$$$$$.


The other thing to consider is the chassis the headers are going into. The more bends, the tighter the bend, the bigger the tube should be, the shorter it should be, and the collector should be longer, like 20" or maybe more.

I think crackedback here on FABO has, or had some 5303 Hookers for sale. If you have an A body and you don't have PS, that's what you want.

 

[Cudafever]

I'm just going to throw this out there. Any header, whether it's 1.5" or 2 inch in diameter will outperform the best cast iron manifolds. No one was comparing, Just Saying......

 

[Marcohotrod]

can't say without more info on the entire combo. I have run 1 5/8, 1 3/4, 1 7/8

 

[ratvon]

Hey the more information I get the better thanks for all the input

 

[FDNY340]

Just purchased 1 7/8 TTI's for my W2 combo. Should be hitting the Dyno next week!! So far I am pleased with the service and the product after a slight hiccup!!

 

[Cudafever]

Hey the more information I get the better thanks for all the input

LOL He is asking you for more info. aka compression, heads, cam, converter, gears exc.

 

[ratvon]

Right now the engine i have is 10.5 to 1 mild cam 202 heads 4 speed 410 gesrs but will be going for 425 hp later on

 

[yellow rose]

Right now the engine i have is 10.5 to 1 mild cam 202 heads 4 speed 410 gesrs but will be going for 425 hp later on

Then you need and 1 7/8 tube. That's a 5303 HOOKER and I think crackedback has a set for sale on here.

 

[Marcohotrod]

425 is fine with 1 3/4"

 

[MMissile]

 

[Cudafever]

Yeah i posted that on another thread. It's amazing, whether you believe it or not.