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Yes could not agree more, IMO engines power output should be be measured in area under the curve. A much more real value.

I started with a scrap piece of cast iron as a test, examined the results and noted time(s). Put in manifolds let it sit for a few hours judging by test sample results. Washed with baking soda water. The acid was only put into the deepest areas of the manifold where a grinder could not reach. Be...

Port your 273 manifolds, I have used Muriatic acid to get deep inside areas and some grinder work no real cost as apposed to hunting down 340 manifold $$$ for minimal gains. I understand wanting PS who wants to drive dump truck thru a parking lot, I can rip a phone book in half (well almost).

None of the above. Hog out the original exhaust manifolds and fabricate a good 3 inch single all the way out pay attention to the Y pipe, use a scavenger design similar to the Accurate Y pipe for the 273 Hipo cars but use bigger pipe. This will sound better flow better and will be lighter than a...

Not to worry, have ran early A's without long time. My 273's driver side don't have the third mounting hole (1966) maybe this is early version?

Yes seems like a lot for not much gain? Years ago I acid ported some 273 manifolds with because I had them on Early A w power steering with a 3 inch single exhaust system similar to Formula S. Seems to work very good.

The data looks cut and paste to me. How can the #'s for 2.5 vs 3 be the same. 3 inch pipe would lose heat faster than 2.5. Disadvantage of 3 vs 2.5... 3 is HEAVY

Decide the pipe diameter layout YOU want not the easiest option for them they are being LAZY.

Rustoleum Ulta high heat (2000 def F) fuses into even rusted surfaces. Rustoleum Paint products are superior.

I have a 3 inch single all the way back, it fits but takes a good exhaust shop... sounds wicked.

Yes 4-5 hundred is not really cheap to most, keep eyes open for a used set early A headers although not too common. My point was not to waste money on other sets of manifolds which offer little benefits.

Only type (Tri Y) being made I know of are old Spitfire design made years ago by an guy named Harold in his back yard. Now Laysons is making them I believe they are 4-5 hundred bucks? Sometimes posters have said there are discounts available for Dougs headers thru Auto Zone I think. Anyhow...

For me thats kind of a boarder line situation with a 5.9, If the 5.9 is going to stay stock the for me I would port the 273 manifolds, much more than stock or future upgrades use 273s and save for headers. Manual steering has more room for cheap spitfire type headers.

Whats the engine? If its a 416 like your handle and your dead set against headers. , then I would get the best flowing SBM manifolds and port the crap out of them. Got a 300hp or less use what you got.

Use what manifolds you have on hand. Spend spare hours with a carbide bit and enlarge and match up the ports and the outlet as deep as you can. Dyno test was written on SBM manifolds and the differences in output did not amount to a dime. People still chasing 340 manifolds as a myth for big...

Check motor mounts, engine could be lower due to wear. Exhaust system may have not made correctly. Worst case turn the wheel so you can grease the idler arm then remove the zerk fitting and plug the hole until its time to grease again.

Any early abodies try any exhaust options using a borgeson PS box?

Don't understand why but it has been my experience that all things being equal a poorly tuned car will exhaust drone much more noticeably that one that is tuned to the best of its combination of parts.

a single 3 inch system flows as well as a dual 2 1/4, just make sure the Y pipe is a good design decent sized pipes off the manifolds