Thinking of going to a set. not sure what brands to start looking for though. input?

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
Jesters's Page of Sick Pleasure
Florida Thirdgenners Message Board

 

I have Hedmans on my race car.



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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association

[This message has been edited by Stephen 87 IROC (edited September 10, 2000).]

 

Any comments/complaints about them? I've heard Hedmans have a problem with warping flanges...

BTW..I checked out your page that car looks SWEET. I especially liek the look of the smooth front.

[This message has been edited by Jester (edited September 10, 2000).]

 

Damn Stephen. Only 1 5/8" headers on that car?

 

He raises a good point...I think you should go to a set of 1 7/8" headers....and give those to me

 

I have the full length hedmans on my 83. I've had them for over 3 years and no problems yet.

 

Header size is an extension of the exhaust port. 1 3/4" headers would be nice but they are also twice what I paid for the 1 5/8". The way the car is set up, 1 5/8" is all it needs. Larger headers would move the gear requirements for my car from 4.10 to 4.56 and move the converter stall requirement from 3800 to around 4300. So unless I want to change other stuff around, the 1 5/8" is what works the best for my car.

Headers are like gears and carbs. Larger isn't always better.

 

This is very true. but I'd still say you would be better off with larger. thats a severe damn engine...and 1 5/8" isn't much as headers go.

 

I have no restrictions with the exhaust. Both pipes have 3" collectors and the only other exhaust system is a 6" long pipe bent down so the exhaust isn't blowing directly on the side of the tranny and shift cable. The downside is going across the gravel pits. I raise a good cloud of dust because of the angle of the tips. I'd like them to point straight back but the would mean longer extensions and another bend to clear the floor.

Wait until this weekend. I get to try my new gears, tires and suspension modifications. I'm also going to run some C12 through the engine. I'm hoping for at least an 11.5 if not better

 

I'm not saying its toally bad...not like sticking a sock up your pipe or anything...but I bet youd see gains from larger headers.

course...if it were me I'd prolly call it "good enough" too.

 

I have read in some of my reference books that 1 5/8" headers are adequate for up to 425 RWHP engines.

As always, YMMV......

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FORMULA 350 TK
Southern California 3rd Generation F-Body Organization©

 

Also remember he's at altitude, so he needs the smaller headers to help with torque.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies

 

I gauran-damn-tee you'd see improvements with larger headers. But whatever floats your boat.

 

i've also read somewhere that 1-5/8" headers are good up to 425hp engines. This months magazine (It was one of those hot rod magazines-forget which) did a comparison on 1-5/8, 1-3/4, and 1-7/8 headers, nicely dynoed and charted out using the same engine. The 1-3/4 headers definitely made more power than the 1-5/8. But they have their advantages and disadvantages depending on the rpm level. I'll be getting 1-5/8" headers sometime this or next month.

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Mods:Hooker Aerochamber 3" exhaust, gutted kitty,
March 2 piece underdrive pullies, smog pump gone,;these two made a very noticable difference.
14x4 K&N open air element filter-the best mod so far
Eibach springs with KYB's all around.
Appearance: Harwood cowl hood, Z-28 wing, painted black(7/20/00)-original color was light blue
*All these mods were made this year
Stock Options:117,000 miles on motor, 5spd, TBI, 305, T-tops
Going to the track this summer, but i'm pretty sure i'm in the 15's now.

 

so;...now that we've established the capability of 1 5/8" headers....are there any options other than Hedmans?

 

Hooker's are 1 5/8", aren't they?

 

Does Hooker make a set of long tubes that fit?

 

My PAW catalog shows their part number of HOO-2460 for Hooker competition headers, 82-92 camaro. $150. They say they are 1 5/8".

 

The 2460's are shorties. There aren't too many manufacturers who make a long tube header for the 82-92.

 

Of course Hooker makes the 2210 long tube header with 1-3/4" primaries. They ain't cheap.

 

nop I definatly need 1 5/8". I have a fairly heavily modded 305..not a race only 383

 

Whoops, the 2460's are shorties. My bad.

 

I have that article on header size comparison.THe 1 7/8 made more power (Hp less torque) than 1 5/8 and 1 3/4 on the mild engine(300 HP engine).1 7/8 is not too big but I would stick to the 1 5/8 for cost,fitting and gearing.Also the difference between the 1 7/8 and the 1 5/8 is less than 3Hp.BTW even on the "hot" engine the difference is less than 5 Hp

Here is the spec of the "mild" engine

355.1 cid
10.1:1
comp cams CS 252H-10
.425 lift i/e,206 deg @.050,110 LSA
vette alum L98 heads (1.94/1.5)163cc intake runners
Holley 650 cfm,no choke no 74 jets prim and sec
MSD HEI distrib 35 degrees timing

 

Howdy there, the headers on my car, as listed in the post above this one, are custom made Stan's Tri-Y headers. Full length, no extra sensors or tubes. I'm getting rid of them for an SLP system though, and giving them to a friend. But if you were interested I could maybe find out more about Stan's if you want. Later

 

But the thing is, in a test like that, they just pull off the small headers and throw on the large ones. No timing adjustments, no jet changes. If they tuned the engine for the best power with the small headers, then put on the large headers and re-tuned the engine, they would probably get more than 5 extra HP. Changing the header size changes the powerband and fuel demands on an engine. If the engine has a cam that likes the small headers (like mine), then they throw on large headers, the cam is then wrong for those headers.

Part swapping must be matched properly. I'm not saying large tube headers aren't bad but my engine wasn't built to use large tube headers. Like I said before. The power curve that large headers would change my car to needing a higher stall converter and lower gears to utilize the power gain from those headers. Just swapping the headers right now would actually slow me down.

 

All I meant was that the 1 7/8 headers doesnt automatically mean youre going to be slower.Thats the reason Im sticking to the 1 5/8.I totally agree with you about keeping the 1 5/8.IMO its better to err on the small side than the larger.

Daz

 

Daz, those test were done with a rather "small" carb (650 cfm). With a bigger carb, those 1 7/8" headers would have made quiet a bit more power than they claimed. Espeacially if they matched a few other engine parts to it.