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Old 09-14-2011, 07:04 PM   #29
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Quote:
Originally Posted by Dunner View Post
I'd be afraid of getting the header sound into the cab.
Which "Header" do you fear the most?

Long tube headers are extremely quiet but those shorty might be a tad louder..

Jim
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Old 09-14-2011, 07:32 PM   #30
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Originally Posted by JimElliott View Post
Which "Header" do you fear the most?

Long tube headers are extremely quiet but those shorty might be a tad louder..

Jim
Time, material and coatings may have changed. I don't hear the chrome Thorley's on my Dodge Ram 5.9L gasser, but I remember them from back in HS having a tinny sound in the driver compartment. Sorry for the bad info. Just sharing what could happen.
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Old 09-15-2011, 07:34 PM   #31
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Actually my cabin noise went down some when I installed the headers. The engine was operating so much more efficiently it didn't need to constantly downshift and rev up all the time.

Later I added some of the J.C.Whitney foil faced sound insulation under the doghouse and that helped a bunch more.
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Old 09-15-2011, 07:59 PM   #32
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Haven't seen a set of headers since, well lets just say a long time ago. I must say at the very least headers will make your rig sound great. I miss those days when fast cars sounded powerful, not like a sewing machine on steroids.

Heat wise I'm not sure about for an RV application but back in the old days some hot rod cars had heat proof fiberglass (I think) tape on the headers to shed the heat from the engine back toward the exhaust.


ha ha ha
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Old 09-15-2011, 11:47 PM   #33
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J.C.Whitney foil faced sound insulation is a good idea. I'll keep that in mind.
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Old 09-16-2011, 05:44 AM   #34
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Actually my cabin noise went down some when I installed the headers. The engine was operating so much more efficiently it didn't need to constantly downshift and rev up all the time.

Later I added some of the J.C.Whitney foil faced sound insulation under the doghouse and that helped a bunch more.

Nick, where did you purchase your headers?
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Old 09-16-2011, 11:57 AM   #35
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Nick, where did you purchase your headers?
What engine is in your rig?
Smog headers needed or not, That will determine your happy hunting grounds for the purchase of headers....

Jim
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Old 09-16-2011, 09:48 PM   #36
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Nick, where did you purchase your headers?
I bought Hedman Elite coated headers from SummitRacing.com.
The headers I bought were specific to the F53 chassis (not just generic truck headers) and are CARB certified with AIR, EGR and O2 fittings.

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Old 09-17-2011, 05:06 AM   #37
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What engine is in your rig?
Smog headers needed or not, That will determine your happy hunting grounds for the purchase of headers....

Jim

460, non-smog 91 chassis. Did you guys keep the cat after you installed the headers and how did you deal with the Oxygen sensors?
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Old 09-17-2011, 05:07 AM   #38
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I bought Hedman Elite coated headers from SummitRacing.com.
The headers I bought were specific to the F53 chassis (not just generic truck headers) and are CARB certified with AIR, EGR and O2 fittings.

Thanks Nick!
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Old 09-17-2011, 08:12 AM   #39
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When you read the claims of "Up To" so many HP. Keep in mind it means if you change the cam, carburetor, intake manifold, muffler, compression, etc, you might see that "up to" HP.
Dunner ...i agree, the whole induction system need changing to "really" gain performance.
i had a 2007 Fleetwood with the 8.1 big block..i installed a set of long tube Hedman headers ($750.00) and
dynaflo mufflers..i did not see any improvement in mileage or performsnce...7.5mpg stock...7.5mpg with headers

IMHO..save money buy a good set of used stock manifolds and use the $$ to buy gasoline

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Old 09-17-2011, 08:28 AM   #40
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If you are going to put headers on and want to improve your performance and mileage, the next step is to spend a few $$$ on a cold induction system or at a minimum a free'r flowing air filter such as a K&N. Free'r flowing exhaust needs free'r flowing air coming into the engine!
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Old 09-17-2011, 12:35 PM   #41
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460, non-smog 91 chassis. Did you guys keep the cat after you installed the headers and how did you deal with the Oxygen sensors?
The later 460 F53s did not have a catalytic. I also installed a full Flowmaster exhaust system. Sounds awesome.

The Hedman system uses a 2-into-1 collector and has an O2 fitting in the collector and the sensor just screws back in.

If you use non-emissions headers, you can weld in an O2 bung fitting but unless you are collecting both headers into a single exhaust and putting the O2 sensor there, you will only be sensing exhaust gas from one bank. Not sure if that would work OK with the computer.
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Old 09-17-2011, 03:36 PM   #42
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Don't think bolting on a set of headers will right all the engines wrongs. First they will eliminate the manifold cracking issue and they will dissipate heat quicker (the mainfolds hold in heat). After headers check your catalytic converter to see if it flows good. Chances are if is orginal equipment it will not. Also you will need a 3 inch exhaust (single tube) or 2 inch (duals) to really take advantage of the headers. An engine is a big air compressor. Along with headers and less restictive exhaust system will allow your engine to exhale easier. Next check and see how you air intake system is. Is it very restictive, if so replace it with a free flowing system. Lastly if you have a ecm get a tuner to change the spark/fuel curve to take advantages of your upgrades. If you have a carb/dist setup up have someone do a tune on the engine. Rejet the carbs and recurve the distibutor to change the spark/fuel curve. This will give you the best performance and fuel milage without a change to the engine.
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