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In my opinion, the '72 & '73 340 manifold is a 360 manifold of the same era. Later the 360 manifolds had the smog ports.

and.... don't get caught up in "273 head". Same port as LA318.

Early A-bodies, now, are a different animal. But the OP has a '71, so not an issue. And yes, 340's/360's have the large ports for the small blocks. And, it really doesn't matter which years. A '89 360 exhaust port will be basically the same size as a '68 340. But the small block headers in...

through the years, just about every year.... lol. I don't know exactly. 70's, 80's, 90's, LA's, Magnum's.... I guess recently, I just put Doug's on my '76 318 heads.... Just had hedman's on my '85 318 in a truck, same headers are now on the 5.9 magnum in the truck..... Just put Hedman's on a...

I've not used TTI's. I know Doug's, Hedman's, Cyclones, and a few others I have used have "small block" headers. I've used on small port heads (273/318) and large port heads (340/360) and no issues.

I guess I was unaware that there are 273 headers, 318 headers, 340 headers and 360 headers. Maybe I've used 318 headers on my 340's?? :rolleyes: :eek:

I bet most headers for '67-76 A-bodies will work, but I highly recommend spending and extra couple hundred and getting Doug's 453.

Dougs was a simple install

I've had good luck with TTI downpipes

I'd pick the mufflers that sound best to you. Even stock two stock mufflers will double the flow, so I would suggest you look at turbo mufflers for a little bit of a throaty sound but not two loud.

Just stick with your 318 manifolds and run dual exhaust. You aren't racing, most of your threads frustrate you and others... and that's just typing words. Just wait till you go to install headers, plus the price (I've seen how prices affect you).... just stick with the 318 manifolds.

Both fit well. Of all of your threads I've read, just stick to the manifolds on your 318. They will fit YOU the best.

RC12YC will get you the small hex and same heat range as the typical RN12YC. Then you can use a smaller socket. HOWEVER, I used the large plugs and socket for years. Cut a wrench short enough to work that fits the plug socket. I ran those type of headers for years and years. 90* boot...

The set I installed on my Duster was a dream compared to the cheapies, mainly the driver's side

Off the shelf - rattle can I like VHT

Each to their own.... but I've never built a car for others to say "wow". My cars only have to please me, and if someone else likes it, fine. But you spend your money to please others, and they don't like it, you just waisted your money.

6" Diesel pipe, exit early straight up through the roof behind the driver. Good for 1000 hp on the street.

remove the starter for the header install regardless. I have Dougs and a mini starter (Dakota starter) on my Duster. Fitment was great.

Dougs installed on my 360 Duster.. hope it helps Basic Header install on Plymouth Duster or Dodge Dart - YouTube

I installed Dougs and for me they fit like a glove. Not one ding was needed.

Never tried TTI headers. I used their head pipes twice and they fit great. I installed Doug's and I can vouch that they fit much better than the cheapies. I would imagine TTI's would fit better than the cheapies too..... just so much is tied into the car - how the motor sits, and how...

Me 3rd on the dynomax super turbo.....

I've not installed TTI headers, but Doug's were a breeze. This is my install

Common with those.... and a pain. Heat and a grip pliers may work. If not, drill starting small.

I figured, but I'm saying he can ship them to you for 20 bucks. 40 bucks for a pair already off and in a box. Can't beat that!

[FOR SALE] - Magnum Exhaust Manifolds - large flat rate game box would be 20 bucks. 40 bucks and you have the pair

I sold my pair for 50 bucks shipped on ebay. Both fit in a large flat rate gaming box. I shipped for 18 bucks.

Looks and Sounds good! I've been happy with my experience with TTI.

Dougs worked great for me. Easy to install, and perfect for changing plugs even on #5 and #7 cylinders. Not 1 7/8, though. I shot a quick video...

No. It's A-body down pipes. All TTI needs is the manifold part number