Header sidepipes
#21
Le Mans Master
#22
Instructor
I liked the 68 factory cover look but did not want to spend the money for factory covers.. nor the power robbing stock muffler system. I had some Ecklers side pipe covers vacuum metalized and clear coated to look like chrome.. then used a set of headman side pipe headers, some 3in tube from Summit, stainless turnouts from Edelbrock and STS uncapped "hot rod" baffles (the hotrod baffles are only 12in long). I adapeted the factory side pipe hangers to work with the clamps that hold the turnouts on. It is by no means quiet. Idles about as loud as my F350 diesel with a flowmaster exhaust. The 427 sounds fantastic thru these @ 6500..
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#23
Drifting
I liked the 68 factory cover look but did not want to spend the money for factory covers.. nor the power robbing stock muffler system. I had some Ecklers side pipe covers vacuum metalized and clear coated to look like chrome.. then used a set of headman side pipe headers, some 3in tube from Summit, stainless turnouts from Edelbrock and STS uncapped "hot rod" baffles (the hotrod baffles are only 12in long). I adapeted the factory side pipe hangers to work with the clamps that hold the turnouts on. It is by no means quiet. Idles about as loud as my F350 diesel with a flowmaster exhaust. The 427 sounds fantastic thru these @ 6500..
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I like it!
#24
Melting Slicks
Member Since: May 2006
Location: Nashville TN
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St. Jude Donor '09
I liked the 68 factory cover look but did not want to spend the money for factory covers.. nor the power robbing stock muffler system. I had some Ecklers side pipe covers vacuum metalized and clear coated to look like chrome.. then used a set of headman side pipe headers, some 3in tube from Summit, stainless turnouts from Edelbrock and STS uncapped "hot rod" baffles (the hotrod baffles are only 12in long). I adapeted the factory side pipe hangers to work with the clamps that hold the turnouts on. It is by no means quiet. Idles about as loud as my F350 diesel with a flowmaster exhaust. The 427 sounds fantastic thru these @ 6500..
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-F
#25
Le Mans Master
Wouldn't it be nice to have some "real" numbers on the difference between the STSs, Sweet Thunder 2.75" and the Hooker Max Flows? I wonder how much of a horsepower penalty the other 2 impose?
#26
Drifting
I have come to the following conclusions. Please correct me where my assumptions are in error.
Hooker Quiet side pipes:
The Quietest and the most restrictive
Hooker Glass Pak:
Louder and less restrictive
Sweet-Thunder 2” insert:
Similar to above
Sweet-Thunder 2.25” insert:
Louder and less restrictive than 2”
Sweet-Thunder 2.5” insert
Louder and less restrictive than 2.25
Spiral Turbo Baffles (undrilled)
About the same a the 2.5 above
Hooker 4” Max Flow:
Louder and less restrictive than above
Spiral Turbo Baffles (drilled):
Louder and less restrictive than Max Flow
Open Tubes:
Loudest and least restrictive
Anyway, you mentioned you would like numbers . Check out the data from a dyno run in a post from ZL1powr. Here is the link. Be sure to click also click on the Video of dyno runs
http://forums.corvetteforum.com/c3-t...-carlisle.html
Hope this helps.
#27
Le Mans Master
HTTP 404
#28
Le Mans Master
#29
Le Mans Master
Think he was referring to this post:
http://forums.corvetteforum.com/c3-t...-carlisle.html
http://forums.corvetteforum.com/c3-t...-carlisle.html
#30
Melting Slicks
I liked the 68 factory cover look but did not want to spend the money for factory covers.. nor the power robbing stock muffler system. I had some Ecklers side pipe covers vacuum metalized and clear coated to look like chrome.. then used a set of headman side pipe headers, some 3in tube from Summit, stainless turnouts from Edelbrock and STS uncapped "hot rod" baffles (the hotrod baffles are only 12in long). I adapeted the factory side pipe hangers to work with the clamps that hold the turnouts on. It is by no means quiet. Idles about as loud as my F350 diesel with a flowmaster exhaust. The 427 sounds fantastic thru these @ 6500..
-F
-F
#31
Race Director
Last edited by 3JsVette; 01-18-2011 at 10:22 PM. Reason: added content
#32
Instructor
That looks fantastic. I have been debating on doing something like that, or go with XS Power or Hooker sidepipes. Your setup certainly looks like it would be the most cost effective solution, and the fiberglass covers should keep things fairly cool to prevent leg burns. Where did you get the Ecklers side pipe covers vacuum metalized and clear coated to look like chrome? How much did that cost you to have done? I am assuming that these are the fiberglass covers, or are they the metal reproductions? Again, nice setup, thanks!
#33
Advanced
Member Since: Dec 2007
Location: Charlotte NC
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Inserts
I have hooker headers and side pipes with both glasspack(great deal from a friend) and the max flows. I personally like the glass pack sound better, but feel they are really robbing my 500hp 406. Not sure if it was all the max flows or the cooler winter weather, but the car is way different with the max flows, very strong. They are real loud though, even the neighbor that likes me threatened to call the noise police. Since I have both I think I will run the glass packs unless I am going racing, takes me a bout 30 minutes to swap them out, but I have yet to re-install my rocker moldings.
I also have a hi pitched chirp out my passenger side with the max-flows that I put started a post on last week. Still not sure what that is.
I also have a hi pitched chirp out my passenger side with the max-flows that I put started a post on last week. Still not sure what that is.
#34
Le Mans Master
I have hooker headers and side pipes with both glasspack(great deal from a friend) and the max flows. I personally like the glass pack sound better, but feel they are really robbing my 500hp 406. Not sure if it was all the max flows or the cooler winter weather, but the car is way different with the max flows, very strong. They are real loud though, even the neighbor that likes me threatened to call the noise police. Since I have both I think I will run the glass packs unless I am going racing, takes me a bout 30 minutes to swap them out, but I have yet to re-install my rocker moldings.
I also have a hi pitched chirp out my passenger side with the max-flows that I put started a post on last week. Still not sure what that is.
I also have a hi pitched chirp out my passenger side with the max-flows that I put started a post on last week. Still not sure what that is.
When I bought my '69 in 1979 it had a '70 LT-1 motor and sidepipes with glasspacks. One day I removed the side tubes and took it for a ride. What a difference! It had to have gained 50 hp, and this was only 350 cid. With glass packs on, the motor would quit pulling at 6000 rpm. Without the side tubes it was still pulling at 7200 rpm. Of course max flos didn't exist then.
The chirp is probably the insert moving around slightly.
#35
Drifting
#36
Safety Car
Compare Hookers with 2 90* bends per pipe vs Stahls with none save the 4" one that points the gases down the side of the car, I don't think an engineering degree is required to say that the Stahls are less restrictive freeing up more hp/torque to the rear wheels. There are some under car headers that might show more gains, but to tie them in to side exhaust usually results in a big S pipe and that will take away any efficency you might have picked up. Is a high lift cam less restrictive than a stock one? Are aluminum tall runner angle plug heads less restrictive than stock iron ones? You go faster by doing one of two things, remove weight (anywhere you can) or make your motor more efficent (by removing restrictions). More hp to the rear wheels has and still is what it's all about. /:\
#37
I just gott'a ask....... are you guys replacing header gaskets a lot with these fenderwell headers? Seems a lot of leverage and twisting might be unavoidable with them.
#40
Team Owner
The quickest way to boost hp on a pre computerized small block Chevy motor is to free up the breathing on both the intake and exhaust sides as the heads were much better at air flow than the stock (iron) manifolds would allow. This has been proven in countless magazine articals over the past 50 years. If you go by mfg. hp numbers an alum intake and most any header will make more hp/torque than their cast iron brethern. If you believe that the hp was always there waiting to be unleashed.....you say tomato, I say tomotto.
Compare Hookers with 2 90* bends per pipe vs Stahls with none save the 4" one that points the gases down the side of the car, I don't think an engineering degree is required to say that the Stahls are less restrictive freeing up more hp/torque to the rear wheels. There are some under car headers that might show more gains, but to tie them in to side exhaust usually results in a big S pipe and that will take away any efficency you might have picked up. Is a high lift cam less restrictive than a stock one? Are aluminum tall runner angle plug heads less restrictive than stock iron ones? You go faster by doing one of two things, remove weight (anywhere you can) or make your motor more efficent (by removing restrictions). More hp to the rear wheels has and still is what it's all about. /:\
Compare Hookers with 2 90* bends per pipe vs Stahls with none save the 4" one that points the gases down the side of the car, I don't think an engineering degree is required to say that the Stahls are less restrictive freeing up more hp/torque to the rear wheels. There are some under car headers that might show more gains, but to tie them in to side exhaust usually results in a big S pipe and that will take away any efficency you might have picked up. Is a high lift cam less restrictive than a stock one? Are aluminum tall runner angle plug heads less restrictive than stock iron ones? You go faster by doing one of two things, remove weight (anywhere you can) or make your motor more efficent (by removing restrictions). More hp to the rear wheels has and still is what it's all about. /:\