Hi everyone

My 65 cutlass runs so much better since i re-install the 4bbl rochester, but it's a little bit too quiet.
I think about switching the original line to a dual exhaust pipes, from headers to muflers.

I'd like to know what brands & parts are avalaible now, and which one did you choose?
How did you do? fitting was good with aftermarket parts?

Thanks

 

Wait…do you have headers or manifolds?
Do you have dual or single exhaust?

Any dual system will automatically sound better than single.
My stock 65 has duals through a no name brand muffler and has such a nice little gurgle.

 

Hi Peter

SIngle exhaust on original cast iron manifolds.
Seems hard to find metal headers for the 330, without hammering the left one to fit in.

Your stock 65, is it a cutlass or a f85?
If you have some pics please?

Do a dual exhaust increase a release the power?

JC

PS: I rode you rebuilt post straight, it's amazing the job you've done, congrats

 

Thank you...it's been an ongoing project.

Dual exhaust might be worth a bit of power and definitely sounds better.
But using headers on a stock 330 cutlass probably isn't worth the headaches.

Do you have a crossover under the engine?
I'm unfamiliar with 65's stock exhaust systems.

 

If you have as local muffler shop, go see them. They can probably bend and install pipes cheaper than you can buy them pre-bent. You should probably pickup about 15-20 horsepower with duals and your but dyno will pickup more than that.

 

Yep. The 1972 350 engine specs show 20 horsepower and 25 Ft-Lbs. torque increase from single exhaust to dual exhaust, so I would expect similar from a 330 engine.

 

Peter

What do you mean by crossover under engine?

 

Redoldsman

Over here we don't have muffler shop, its not the kind of parts we change very often. And even if there are some, we are not used to built our own stuf, we order oem parts...

 

I am NOT sure about 65’s…
But later cars that had single exhaust had a cross over pipe like the one below.
its makes it harder to add dual exhaust.

You would have to find a block off plate for the manifold that has the 2 outlets.
Thorton sells manifolds that were meant to have dual exhaust.
OR you can get shorty headers which look easy to me.

 

There are options for that. The block off plates are available from the aftermarket. Or cut the crossover pipe near the flange, crimp it, and weld it closed. I’ve seen that many, many times over the years.

 

That’s what I did when I had my first Olds at 19. Hacksawed off the pipe, went to town with some vice grips and just crimped it closed.
Couldn’t weld yet, so it stayed like that. Thought I was the only one!

 

OK, i'll do that.
And do the xpipe better than Hpipe?

 

I would put one individual pipe on each side, not an X and not an H. The factory did not use an X or an H and it sounded very good.

 

X2 I don't think at that level of power any X or H pipe is warranted. Keep it simple!

 

Unfortunately the miniscule bump in power comes at the expense of taking away from the aggressive sound you are looking for... So I also go with no X or H. Recently had my exhaust redone, from cats to exhaust tips. And went no H pipe this time.

 

I have run X and H pipes. The H pipe quiets the exhaust but I didn't notice a change in tone. I added it and set of Summit Turbo mufflers on an Olds 307 wirh full length headers, 2.25" duals and glass packs. Until I added the H pipe and Turbo mufflers, it was unbearable in a no interior 78 chebby 1/2 ton truck. I used a X pipe with 2.5" duals, shorty headers and Hooker Aerochamber mufflers with 2.5" tail pipes behind the tires with an Olds 350. Probably the best sounding exhaust on any vehicle, louder but no droning. I have owned. My current full length stainless headers, 2.5" stainless dual cats, pipe and stainless Flowmaster FX mufflers with 2.5" tail pipes exiting behind the bumper. Just loud enough for my liking. Just duals with the right mufflers will be night and day better sounding and performing.

 

Thanks u all for the tips, i'll do dual lines no x or h, flow master, 2,5" tubing...we'll do it this fall, now i wanna cruise, and save $$$$

 

Hi every one, it's been a long time for me w/o cruisin' my 65, due a carcrash last october 24.
Finding a shop to chrome bumpers over here is a true nightmare, *****$ŕ greenlaws...i sent mine in portugal, 3000€ both rear and front...


A friend of mine will ship stuff from TX to Europe in january 26, so i would like to buy a a full exhaust line : tubes and mufflers.
I saw many off them on summit , pypes, opgi, flowmaster.....and other but too many choices makes mistakes

Before ordering it, i would like to know wich one did ordered for your 65?
My son will weld it if needed


It's to be install on the 330 engine, i'll keep my original manifolds, oem headers seems to be pain in the *** to install.

thanks for your help

 

Pypes is the only down pipes from the manifolds to rest of a system that I know of. Just go for a system and add the Pypes down pipes. Mufflers are a matter of what you want for sound level. Turbo mufflers are usually the quietest next to stock replacements.

 

Are Waldron Exhaust systems an option?

https://waldronexhaust.com/product-category/complete-systems-for-cars/oldsmobile/1961-85-olds-f85-cutlass/

 

Waldron is a good option. I used them for duals on a 1954 with power steering and they fit nicely all the way from the manifold. Good folks

 

I found this

1964-74 Oldsmobile Cutlass / F-85 V8 Dual Exhaust – Waldron's Exhaust

seems to be complete, from headers to bumper.

I run the original engine, original carb (rochester 4bbl) , if i keep the original headers, do a 2,5 diam exhaust line better than a 3"?

 

The factory set up is 2.25" up to the mufflers, then 2" tail pipes. For a stock 330, plenty fine and definitely easier to fit vs a 3" system, which arguably too big. Almost forgot about the Waldron system. By the time you buy down pipes with a Pypes but is a 2.5" system in stainless. But it isn't any more money for the Waldron dual exhaust, unless you opt for stainless. Interesting on the different diameter on some 330 manifolds, you will need to measure the inside diameter before ordering.

 

X2 on 2.25" to mufflers and 2" out. That is more than adequate for a 330 or 350 CID

 

I've just received the answer from waldron, they are the only one to make the downpipes for the 64-67. Even pypes does not.
So, i will order this
1964-74 Oldsmobile Cutlass / F-85 V8 Dual Exhaust – Waldron's Exhaust

Hope it will fit easily .

Do i willl have to set up the carb or ignition?
Its the original rochester 4bbl

 

Dual exhaust without headers should not need any change over your current tune.

 

Cause my container will leave texas by early january 26, and waldrons have a current lead time 10-12 weeks, i need to search for an another brand.

Does anyone here knows them on ebay?

Classic Car Exhaust Systems | eBay Stores

 

You appear to be fluent in English. Call Waldron via telephone and tell them about your circumstances. See what they say about helping you meet your deadline. Do not email them.

 

thanks tricarb, not always easy to do it by writing, but all of you are gentle to reply to me too.

I've mail them this morning and ruth, at waldron, told me they can not promise me nothing, caus xmas holidays, so before ordering i try to find another company to get deliver on time

maybe someone here already ordered at classic car exhaust, we'll see within few days

 

Waldron supplies the most low demand systems. It has been around a long time. Given where you live, ordering from another supplier is risky.

 

I had a muffler shop do mine with DynaFlo mufflers. A very nice sound although slightly louder would have been nice.