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#1
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exhaust recommendations
I have a 69 coronet with the factory 383 4 barrel and dual exhaust. After 40 years, the original exhaust is now toast. I want to put a new set of duals on from the manifolds back. My dad thinks I should replace the stock manifiolds with headers. This car is used just for weekend use and I want a car that is reliable. I need to take the manifolds off anyway because I have a leak near the engine.
My questions are: what size exhaust/muffler is good for a stock 383. I want something that sounds good but is not to loud. Should I stick with my stock manifolds or should I go ahead and get some headers. If I go with headers, what is a good set up to get that won't break the bank? thanks for any input. brian |
#2
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Manifolds can't be beat for there very durable. Well, really extremely durable.
Your cars engine can use very well the headers not only for improved power, but mileage and a cleaner runner. Stock carbs back in the day were rich running and headers leaned them out for excellent air and fuel ratios. The brand header, I can not recomend, sorry, but a standard street header works fine for stock engine with minor bolts at most. Your exhaust pipe size should not exceed 2-1/2 inchs. It would be best to connect each side with ethier an H pipe or X pipe. In my daily driver, my 400/727/3.55, 1979 Dodge Magnum, I run Headman Elietes. Small starter clearance issue. My mufflers are Hooker Aero Chambers. There quite enuff to speak with people inside the car, windows up or down, stero off or on at a moderate level, (But @ over a 1,000 watts, who cares what your sayin) They do not get to loud until the RPM picks up at around 60 MPH or so. And it still isn't to bad. P.S. 26 inch tires and 3.55 will rev a bit on the Hwy at 70+. P.S.S. My exhaust pipe size is 2-1/2 w/ an H pipe. |
#3
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stock 383 for cruising?
I'd stick with the manifolds, and go with dual 2 1/4 and dynomax mufflers. Dynomax are a little old school, but inexpensive, and perform well for the money. |
#4
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That would work!
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#5
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Quote:
I agree with Rumblefish. Put some performance in your 383. -Bob |
#6
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383 exh
hedman jegs 500-78030 151.99 pretty good cheap header. dynomax super turbo good old school sound, and for not a lot of money.stock man. should be fine if mtr. is stock.
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#7
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Mancini Racing has TTI systems for headers and manifolds. If you don't want to spend alot on headers I'd recommend staying with manifolds. You get what you pay for, especially headers.
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#8
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I port-matched and polished my HP manifolds, also took heat riser out and brazed the flapper holes shut. I have the TTI 2 1/2" X pipe system with Dynomax Super Turbos (the long ones), with tailpipes out the back. Nice low growl at idle, sounds very good wide open. At 65 you can still talk without screaming to each other.
Will never put headers on my street driven 440 Charger. |
#9
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Lotsa good options here. If your car does not have the factory HP exhaust manifolds, I'd go with the Hedman shorty headers as opposed to paying the $ for original/repro HP manifolds. They flow as well if not better & are less expensive. I run them on my 67 440 Coronet & they fit/work fine. I'd use 2 1/2 dual exhaust with either an X or H pipe, 3" isn't really necessary unless you're pushing more than 500 HP, unless you like alot more noise/difficulty in install/expense. I like Flowmaster 3 chamber mufflers, but Magnaflow or even Dynomax Turbos are fine. If you decide to go with full-length headers, keep the primary tube diameter to 1 3/4 or 1 7/8 max with an otherwise stock 383.
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#10
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thanks alot for the info. I am leaning towards staying with my stock manifolds. Am I correct in assuming that there are different types of manifolds that were put on by the factory. If there are, how can I tell if I have HP manifolds or not.
The reason that I am hesitant about headers is that I have never put a set on and I know they can be a real pain. Cutting the car to make them fit is not an option for me. Also, will I have to change the starter for the headers if I do go that route. I beleive that I am going to go with a 2 1/4 inch exhaust pipes and 3 chamber mufflers as well as an H or X pipe. One last question: How do your exhaust exit from the back of the car? Do you have a pipe the goes straight out the back, are they turned down or angled to the side? One last thing, my 383 is extremly strong. I can't imagin what a 440 or a 426 would be like in a car that I have. Thanks for you inputs. Brian |
#11
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There are actually several variations of both the non-HiPo & HiPo exhaust manifolds. The best way to describe the non-Hp manifolds is that they are basically "log style" in shape. The Hp versions have a longer runner shape with the driver side & passenger side looking quite different from eachother. Maybe someone can post pics of what they look like here. Otherwise, I'd bet you'd find pics of them on ebay, maybe look them up as 383-440 magnum exhaust manifolds. I seem them listed all the time on ebay. If you have a set on your car & would like to keep them on, go for it. If you have the regular non performance manifolds, I'd suggest the Hedman shorty headers. They fit well & will flow better than either type exhaust manifold, + you'll probably pay less for them than a used set of HP manifolds. They are 1 3/4 primary tube w/ 2 1/2 collectors which will work fine for a stock to mild street BB engine. I think that they're around $160 thru Summit racing.
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#12
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Hp Exh Man Cast #
68 -69 HP-2806900-RH 2843992-LH These are the casting numbers for 68-69 Big Block HP manifolds. Hope this helps.
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#13
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Cutting is not required and the stock starter will fit. Most people go with a mini starter because they are easier to remove after the headers are installed.
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#14
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Thanks alot for the info. I have the HP manifolds so I am keeping them on the car. I am now looking for a good shop here in my area (knoxville TN) to do the work for me.
Brian |
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