Headers
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
Headers
I just finished putting a 383 stroker in my 63 coupe. The motor got 410 HP and 440 TQ on an engine dyno before installation. I just drove it to Sacromento and back here to Las Vegas and then from Las Vegas to Los Angeles and back. While in Los Angeles a friend told me I should get rid of the stock manifolds and go with headers. I called the engine builder and he said the same thing. Today I ordered a set of Hooker Super Comp headers with one and three quarter tubes and a 3 inch collector. I was told they will work. Does anybody on here have any experience with these in a C2. I'm hoping they will not be lower than the frame rails or I will go with something else. Dave
Le Mans Master
Joined: Apr 2005
Posts: 6,336
Likes: 416
From: Seattle Area WA
AHoover posted some good pics on how low Hookers are compared to Dynomax headers.
http://forums.corvetteforum.com/c3-t...ns-please.html
http://forums.corvetteforum.com/c3-t...ns-please.html
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
Thanks for the quick reply. It looks like either one will work but I looked up Dynomax and they don't list anything specific for Corvettes under the applications. Dave
Last edited by 32361ARTHUR; Jan 31, 2011 at 07:38 PM.
Paid Senior Member
Joined: Jul 2006
Posts: 1,737
Likes: 35
From: OP KS
I went with a set of this direct replacements. don't have any dyno numbers yet. They are direct fit replacements.
http://www.vetteheaders.com/servlet/...ders%2C/Detail
http://www.vetteheaders.com/servlet/...ders%2C/Detail
Paid Senior Member
Joined: Jul 2006
Posts: 1,737
Likes: 35
From: OP KS
First line of the description:
The headers that fit 396, 427, 454, and 502 corvettes from 1965...
A quick way to tell SB and BB apart is if they are evenly spaced then you are looking at BB and if the two in the center are closer together then you are looking at SB manifolds/headers.
Here's a link to McJacks. there is a how-to article on the front page, if you want to do it yourself.
http://www.mcjackscorvettes.com/
Last edited by fullcontrol; Jan 31, 2011 at 08:17 PM.
Paid Senior Member
Joined: Jul 2006
Posts: 1,737
Likes: 35
From: OP KS
Sorry, me forgets 383 is small block, duh! 
Here's another link for you.
http://www.vetteheaders.com/servlet/...orvette/Detail
or might be better to start here
http://www.vetteheaders.com/servlet/...rvette+Headers
Here's another link for you.
http://www.vetteheaders.com/servlet/...orvette/Detail
or might be better to start here
http://www.vetteheaders.com/servlet/...rvette+Headers
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Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
I have rack and pinion steering in my car but I don't think that will be a problem. I got some that are ceramic coated inside and out. Will that pretty much eliminate any under the hood and floorboard heat problems or can I expect the heat to be noticeably higher? How about a starter shield, will I need one of those, I'm running one of those hi torque small ones. I was going to go with one of the short header manifolds from MacJack because it would be nice and clean and simple. My engine builder said I needed full length headers to get the most HP out of this engine. Dave
Last edited by 32361ARTHUR; Jan 31, 2011 at 08:50 PM.
Pro
Joined: Jan 2005
Posts: 510
Likes: 19
From: Waterford CT
rack & pinon issue
I have rack and pinion steering in my car but I don't think that will be a problem. I got some that are coated inside and out. Will that pretty much eliminate any under the hood and floorboard heat problems or can I expect the heat to be noticeably higher? How about a starter shield, will I need one of those, I'm running one of those hi torque small ones. I was going to go with one of the short header manifolds from MacJack because it would be nice and clean and simple but my engine builder said I needed full length headers if I want to get the HP out of this engine. Dave
As for heat issues, get ceramic coated headers. This will minimize heat transfer out of the tubes into the car. You can always use thermal wrap on the headers also. I have done this on several cars. Looks dumb, but works.
When changing from cast manifolds to good headers, like hooker super comps, you will find the HP increase notable. I used 2 1/2" chambered exhaust under the car, and it sounds great.
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
At this point I have already ordered the Super Comp headers and will know by the end of the week if the rack and pinion will be a problem. It looks like it won't be but nothing surprises me anymore. What are CHAMBERED exhausts?
Melting Slicks
Joined: Oct 2006
Posts: 2,366
Likes: 105
From: Flower Mound TX
Melting Slicks
Joined: Oct 2002
Posts: 2,316
Likes: 111
From: St Louis MO
I just finished putting a 383 stroker in my 63 coupe. The motor got 410 HP and 440 TQ on an engine dyno before installation. I just drove it to Sacromento and back here to Las Vegas and then from Las Vegas to Los Angeles and back. While in Los Angeles a friend told me I should get rid of the stock manifolds and go with headers. I called the engine builder and he said the same thing. Today I ordered a set of Hooker Super Comp headers with one and three quarter tubes and a 3 inch collector. I was told they will work. Does anybody on here have any experience with these in a C2. I'm hoping they will not be lower than the frame rails or I will go with something else. Dave
__________________
1965 Convertible
NCCC 2B National Drag Record Holder
11.34 second 1/4 Mile
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
I am glad to hear that, especially that they fit your 65. I ordered the same ones. I never got an answer back as to what a "chambered" exhaust means, do you have an answer to that? What kind of mufflers do you use on your 65? I see that yours is an eleven second car, is it also driven on the street? Thanks, Dave
Melting Slicks
Joined: Oct 2002
Posts: 2,316
Likes: 111
From: St Louis MO
Chambered exhaust is a series of crush bands on the pipe itself like is used on side exhaust pipes for the mid-years. (I have heard that they don't flow as well as a low restriction muffler.)
For my normal exhaust, I prefer a full 2 1/2" system to low restriction mufflers such as the DynoMax Ultra Flows.
Disclaimer: No muffler was harmed in the setting of any record!
For my normal exhaust, I prefer a full 2 1/2" system to low restriction mufflers such as the DynoMax Ultra Flows.
Disclaimer: No muffler was harmed in the setting of any record!
Le Mans Master
Joined: Apr 2005
Posts: 6,336
Likes: 416
From: Seattle Area WA
Chambered exhaust are not as free flowing as a good set of turbo style mufflers.
Here is a link to chambered mufflers so you can see what they look like.
http://www.classicchambered.com/classic/products.html
Pro
Joined: Jan 2005
Posts: 510
Likes: 19
From: Waterford CT
Chambered exhaust
I am glad to hear that, especially that they fit your 65. I ordered the same ones. I never got an answer back as to what a "chambered" exhaust means, do you have an answer to that? What kind of mufflers do you use on your 65? I see that yours is an eleven second car, is it also driven on the street? Thanks, Dave
I have owned and raced big & small block vettes for over 40 years. Now, I have never made an actual dynamometer test comparing chambered pipes to a turbo muffler, or open pipes for that matter. However, the chambered exhaust pipes flow straight through a tube, from end to end. While even a turbo muffler causes the exhaust gasses to turn direction once or twice. Their design intention is to reduce noise with a minimum of back pressure. But to say performance is improved by using turbo mufflers over chambered exhaust? I'd like to see the dyno sheet. Not just an opinion.
Check this YouTube video for what they sound like. I installed under car exhaust so the sound goes out the back of the car, instead of exiting by my head. I have lost the hearing in my left ear thanks to loud exhaust.
Check this out. Mine sounds the same, with super comps as you ordered.
http://www.youtube.com/watch?v=atcbyr0rXoA
Le Mans Master
Joined: Apr 2005
Posts: 6,336
Likes: 416
From: Seattle Area WA
The problem with chambered exhaust is that the ID is greatly reduced by all the teeth that stick up into the airflow path. These change the laminar airflow into turbulent airflow while increasing system backpressure. If you use them, get the largest diameter you can fit.
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
My car has a 200R4 trans in it with a modified crossmember. There are two holes that the exhaust goes through and I don't know if that is stock or not. The O.D. of my present pipes is about 2 1/8" and they lead to Dynomax mufflers. I might be able to go with 2 1/2" pipe all the way. Right now my biggest concern is weather the drivers side header will fit because I have rack and pinion steering and there might be a clearance issue.
Thread Starter
Racer
Joined: Jan 2011
Posts: 407
Likes: 5
From: LAS VEGAS NV
Larrywalk, could you tell me how close your headers come to the frame rail on the drivers side. I have a bracket on my frame rail about even with the center port on the engine that holds a shaft for my steering. Thanks, Dave