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Yeah a lot of monkeying around with engine location is needed on a large number of these cars.

A lot of tubes on mine are 1/8 inch away from things. But I run Schumacher Torque Strap so engine does not move and no vibrations and stock biscuit mounts don't break either.

Like if a door gap was 1/8 inch on one car and a giant 1/4 inch gap on the next car rolling down the line quality control would look at it say yep thats fine ship that car to the dealer. Not to mention pot smoking hippies working on assembly plants in the 60s....

If the k-frame motor mount locations were shifted 1/4 inch one way or the other that was considered within spec when the cars were built. Tolerances were loose and for factory parts that was usually fine. But when we go to put headers on that loop around everything and require extremely...

The original welds on my k frame look like some pot smoking hippy in the 60s welded it up. And mine is sloppy requiring shims between mounts to get the headers to fit. Back in the 80s I ran Hooker Headers, didn't know about sloppy k-frames, and beat big dents in them to fit. Then the internet...

Even on clean original unmolested cars engine can be sitting in there wrong due to extremely sloppy factory tolerances. Now add all those other factors age, ppl swapped k members, prior damage, aftermarket motor mounts, mods etc then probability of engine not located correctly goes up. The...

The factory k frames and frame rail tolerances are very sloppy with these cars. Thats why TTI publishes engine placement specs. Cause if engine not located correctly side to side and height wise the headers wont fit. For my TTIs I had to add one motor mount shim on driver side and two on pass...

My Ultra Flos been on my car for over 15 years still look perfect and sound great. I also put Ultra Flo on my fox body and it sounded like a UPS truck terrible took them off and put Super Turbos on instead. So depends on car how they will sound.

I don't thing there is an adapter but you can but the 2 1/4 flange: TTI Exhaust Collector Flange

Looks correct to me

Here is a thread on the topic: 340 HP Exhaust Manifold Bolt/Stud/Nut Locations

Do you still need pictures? Cause my '69 340 has the manifolds bolted to it with reproduction hardware. But its under a table with blankets and plastic piled on it but I can get pictures if they still needed.

If you zoom in you can see where the H Pipe bulges just after the trans cross member. The TTI head pipes slid in back there. I welded grinded the H Pipe to collector pipe connection which is forward of cross member hard to see where those join....

The TTI 340 manifold head pipes I used to have on my car ended just past the trans cross member. When I swapped to TTI headers a 8 - 10 inch extension from the collect was needed to hook up to where the manifolds were

Yeah everyone should run headers blow the doors off all the cars with manifolds. Every car is faster with headers. Every car with headers is faster than every car with manifolds. So stop smoking clear get headers. Puff puff pass....

You can get a custom cam ground to reduce the losses that the manifolds cause. Most off the shelf cams assume headers hence bigger losses with those.

The TTI head pipes are mandrel bent right off the 340 manifolds no pinch. They flow like giant over sized sewer pipes. TTI routes the head pipes differently depending on auto vs 4 spd. But either way a full 2 1/2 and no exhaust flow choking pinch. Dynomax Ultra Flo mufflers are straight...

Gains depend on cam profile, head flow, head flow numbers, stroked or not, and dozens of other factors. A stockish type low cam lift stock port engine will have modest gains like you are thinking. A stroked small block ported aluminum heads 600 lift cam ect will be gaining 50-60 or more hp...

They have fellro 60025 listed on rockauto clearance priced.

This would prob work: Vibrant Performance 1456 Vibrant Performance Exhaust Flange Gaskets | Summit Racing

Modest gains on milder engines yes. With a large cam high flow head and/or stroker then headers can gain 50 hp or so over manifolds. So how much hp headers gain depends on engine combo. If you go with TTI exhaust with manifolds then decide later want headers you can pull head pipes out of H...

The passengers side '71 340 was more restrictive lower flowing then the '68-'70 pass side. '71 drivers side flowed as much as the earlier ones.

The '85s had two tail pipes but a Y pipe off the engine that split back into two. '86 was first year for true dual exhaust on the fox bodies.

TTI headers, TTI 2 1/2 inch H pipe, Ultra Flo mufflers, TTI 2 1/2 inch tail pipes with tips, no drone. Ultra Flo on my car not loud at all unless I go wide open throttle and even then the roar from carb sucking in air is much much louder then the exhaust. Dynomax mufflers that are offset in and...

Yes and had to make sure cars could be thrown together quickly on the assembly line and not have pipes hitting frame, gas tank, leaf springs etc. So the small pipes with pinches restrict flow to some extent but were ideal for a production car assembly line purposes.

Cool to see to original style tail pipes being reproduced for the folks that want that original part.

Didn't '69 have the different gas tank straps then '68 maybe thats why tail pipes were different?

So '68 '69 Barracuda and '70 Dart use same tail pipe but original Barracuda tips had an extra bend in them for more tilt up?

Reminds me one of these days do something to get my reproduction tips on TTI tail pipe to tilt up for correct look....

Can't speak for the various dyno test comparisons done over the years. But I think a more valid comparison is using an unpinched driver side head pipe when testing the manifolds. Also passengers side heat riser could be partially stuck closed too which would choke power too.