I picked theese up and was wondering what is the gain possible over my headman full lengths, they are super comps from hooker and ceramic coated, i think 250$ was fair...




I hope they will pick up a 10 or more HP gain maybe.

 

Well they're equal length headers compared to shorty headers so right there they'll perform better. I'm assuming they're designed for a third gen? What size are the primary tubes and what size is the collector?

 

he had hedman FULL lengths, not shorties. if you look at those tubes, you can easily see that they are NOT equal lenth primaries. but i'll give you the low-down on small block chevy headers for our cars:

hedman longtubes: 1 5/8" primary, 3" collector, collector length is a few inches shorter than those pictured

hooker super comp longtubes: 1 3/4" primary, 3" collector, length shown. those are p/n 2210 and are for a thirdgen.

it depends on your combo zone. if your going back to the bigger cubes (383+) with good cylinder heads, you could see some rather large gains. but like for my car with the little 305, it needs the smaller primary tube size to help keep the velocity up for that small of a motor. hope that gives you some insight.

 

When I had a 383, I was running 1-5/8" full length headers and was running high 11's at 118 mph. It's possible I could have run slightly faster with 1-3/4" primaries but at the time I couldn't justify the increased cost of the larger tube primary tube headers.

Only a dyno tune will tell how much difference they will really make.

My 540 has 2-3/8" primaries and 4" collectors. There is no need for bottom end torque. The cam starts to make power around 4500 rpm.

 

Nova, it is going to be a 383 vortec, heads are ported verry far but i retained the 1.94 valves, i think the XE cam i am using will lose a bit of torque but step the power up a bit compaired to a smaller cam of course, the headmans i have were hacked to clear the slave, i have been told theese will clear great.


Stephen, can the headers you are using for your biggun be used with full exhaust like a street car? The hooker big block headers for our cars are only 1/7/8s, that is not enough i dont believe to support my 700 HP goal on motor for the 496 in the future, what do you think?

 

The Hooker Super Comp headers are designed for a street car. Mine are full race headers. Although I have the pipes twisted around to use mufflers located under the rockers, I don't think they would survive very long on a street car especially going over speed bumps.

Check out the exhaust pictures on my web pages.

 

An interesting story by Joe Sherman on another web site when he was building his motor for the Engine Master Series which he won.

Basically when he was testing the motor on the dyno he tried all types of long tube headers to see which ones were the best. I believe he was using 1 3/4" headers. The bottom line was there was hardly any difference between them. Certainly no more than 10 horsepower going by memory could have only been 5hp. I think he went with Hedman's because of the prize money he would get from them if he was using their product and won.

 

Stupid question but I also am running the same hooker headers 2210 pictured. Do you guys seal that loose back primarie with some sort of sealant or just slip fit it? I have been running mine just slipped togather.

 

The guy i got them from said they didnt leak and he didnt use anything so i assume it is fine with nothing used for sealant, i will find out.
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Well, my headmans are hacked up to clear the slave cylinder so the gain for me might be better than usual.

 

everything i've read says they just slip together and seal fine...

 

Anytime we have slip tubed headers we always smear a bunch of Permatex copper silicone stuff on them to ensure they seal...i guess we've never tried it without anything, but it sure makes them slip together and come apart really nice, and no leaks

as for power, you wont notice much depending on your combo..i was worried going from my 500hp 388sbc to my 600hp 427sbc that these 1 3/4 would'nt be upto the job and a 2" primary would be better, but i had a few guys i talked with that made the change and noted zero on the track, so i would suspect the same thing in your case too.

 

I went to Hooker super comps last year from hedman hustlers. Both are 1 3/4 tube, the hookers are equal lenth and the hustlers are not. The hookers sounds much better and I thought I'd pick up a bit. Didn't do a thing for et or mph. The hedmans may have had a little more low end, but can't verify that. Just felt like it to me. they problem I had with the hedmans was they kept cracking right up next to the flange. And they were only 4 years old, never ran on the street. I do have a little more clearence on the steering shaft with the hookers, so I'll stay with them.

 

Well, between going with the old casting 70 turbo heads to the Dart pro 1 aluminums i thin the gains will be significant, as well as forged rods, pistons and a larger cam. I am sure ill make over 500 hp this time around.


Thanks fellas.

 

my hookers arent here yet, but just by looking at the pics above, you can clearly see they are not near equal length. first tube is a good bit longer than the last tube on each header

 

If you were looking at my reply. My hookers are equal length. My hedmans are not. Mine don't look like the ones above. All hookers are not equal length. Just wanted to give the results changing only headers, nothing else, except jets. Ran leaner with the hookers, but not faster.

 

oh ok, i thought you ment hookers as in 2210's as thats the popular hooker in 1 3/4" primarys for our cars

 

I thought yo uwere speaking of the general length as the headmans i have were 4 inches or more shorter on one side over all.

 

I have never used any sort or sealant on any slip fit header. I guess logically I don't understand why slip fits would leak when exhaust is pushed through the header and will take the path of least resistance which is the collector. It would be really odd that the exhaust would run back into the header to cause a leak. Most slip fits fit have atl east 1 or more inches iof tubing inserting into the other tube. I can see a leak if it was a 1/16 of an inch or so.

 

mine leak there only cause i had to put a dimple in that area for clearance
i hear a slight leak at idle
http://www.youtube.com/watch?v=zwY6qPaQoy0

its a slight tick ...may not even hear it

 

only reason i can see leaks is exhaust in the pipe is at ahigher pressure than outside air, so it could expand out thru the tube, but alittle copper silicon is good insurance