Before you tell me to search, i have. Do the D shaped exhaust ports work with regular headers ie Edelbrock TES headers for TPI??
If so do they work well???
thanks

 

They bolt up, but the 1.5" primary TES will probably be too small to line up well with the d-ports and there's not enough meat there to fix it. The larger 1.75" primary headers like the SLPs will work better and be less likely to have exhaust leaks.

 

TES headers are the most restrictive out there.
The ports are smaller than the ports on any heads, bar none.

 

I believe it is a 1 5/8 primary if it makes a difference. Just a scoach over 1 1/2...

The TES headers are pretty much the only california smog legal headers out there. Everything on my car is CARB approved so it is gonna be slower already...

 

Same ones I was talking about. They narrow down to 1.5" or less at the flange opening.
Take a look at some and measure them.

 

if your low on dough go for some hedmens, and sell them tes. they have long tubes for autos and shorties with stick. they should work

 

The Corvette heads have raised exhaust ports, higher than stock. Edelbrock headers already suck on stock heads, so they will be even worse with the raised ports. Get either Hooker 2055 1 5/8" headers or Dyno Don's 1 3/4" headers. Or some used SLP headers if you can find them.

 

Ditto what Kev said. I actually had this combo back when I had a 305. L98 C4 vette heads that were stock and the TES headers. They fit, just didn't realize how much they sucked until I switched to a true 1-5/8" header. Picked up around 2 tenths and just over 1mph when I went to the SLP Tri-y combo. Too bad they don't make those anymore. I think those were the best headers out there for most 305 setups.

 

does anyone want to buy some Aluminum Vette Heads casting no. 10088113?

 

wish I had the money

 

are you selling aluminum heads if so what shape, miles ,complete ready to bolt on shipping quote to 40215

 

Hooker 2055, smog leagal and decent flowing

 

i have a 91 vette motor in my car with the edelbrocks they fit no problem and they are decent headers with my superchrger i make 340 to the wheels and those headers are just fine

 

What more needs to be said about Edelbrock TES headers. When a supercharged car puts out about the average hp of naturally aspirated cars on all motor with cylinder head, intake, & exhaust mods, it shows how much the Edelbrocks strangle the hp. Decent headers should get a supercharged motor over 400 at the rear wheels.

 

Dont mean to interrupt, but hypothetically, if i were to put these heads on, and got some new headers, how much hp/tq would i be able to salvage?

any ball park number is fine.


Another thing to note is I have dual cat convertors. Would i be able to use the same y pipe from Ebrock? or would i have to fabricate one, because the 2055s are for single cat cars...


And for the love of god will someone tell me how the hell i would get EGR to work on this set up?? i have the Edelbrock intake manifold that has an egr port in the back of the passenger side. I konw i will need the vette pipe from ebay but what the hell does it connect to/from??? the passenger exhaust manifold to what?



Thanks guys,
Boldguy

 

Where are you in Cali? Basically the 1985-1991 Vette had to have egr, but the heads did not have passages, so GM ran a tube off the exhaust manifolds to the plenum, if I remember correctly, for egr passages. You would want a custom fabricated Y pipe. The Edelbrock piece is as restrictive as the rest of the Edelbrock system. Go to the So Cal board and send a P.M. to Dyno Don, he builds headers, and Y pipes that pass smog. He has also built egr tubes to use Vette aluminum heads on our cars with tpi. I think JulieGta's current engine that Don built for her has ported Vette heads and the egr tube installed. At the last dyno day the club did a couple of weeks ago she saw 321rwhp and 377tq.

 

russ so your telling me a decent set of headers is gonna give me 60 moreHP at the wheels thats bull***

 

Tom86iroc:

I agree with Russ to a point. You are losing some big horsepower somewhere. Those Edelbrock headers would be the first place I would start to find the lost horsepower. Maybe the rest of your exhaust system needs to be upgraded. You are making the average RWHP of our naturally aspirated modified TPI cars. You would get spanked by half the cars in our club.

 

its totally stock no porting or anything all bolt on it's only 6psi paxton and i built this 15 years ago guess i'd be slow out in cali

 

OK, that makes more sense. You are not doing bad for what you have.

 

You are probably also losing power from your cam. The stock IROC cam probably has enough overlap that part of your charge is going out the exhaust. A cam that works naturally aspirated will usually have too much overlap for a blower. What you want with a blower motor is extra lift but as little over lap as possible. I think 6psi boost with a proper cam, a good exhaust system, and a larger intake if you don't already have a large base and large runners should get you to 400 maybe even 450 at the rear wheels. We have three or four cars out here that are putting down 350 rwhp or better without power adders. You might think that 6 psi isn't much, especially if you compare it to some of the blowers that put out double or triple the boost, but when atmospheric pressure is @ 14.5-15psi, you are increasing the pressure by 40-45%.

 

Don't discount it so fast. I've seen 70hp gain from exhaust upgrades on a NA 383. I think it's worth looking into to upgrade. Boosted engines are especially sensitive to backpressure.

It may be about time to upgrade your TES to something stainless that will last longer anyway. You said it has been running like that for several years.

 

It will depend on the whole combination of parts you have like the camshaft you are running.
If the head swap increases compression by about 1 point, you have a stock camshaft, and you switch to 1.75" headers then I'd expect around 25 - 30hp.

If the heads are also heavily worked (ported) with a performance valvejob and valvespring upgrade and a swap to a mild performance camshaft, you could see 60 - 70 hp improvement if there's no other restriction holding it back like a bad tune.

Power gains are never a given because of so many variables - especially the tune. There are times when a part swap can cause a power loss before the tune is adjusted for it.

 

Please tell me how a header that covers 20% of the exhaust port on a stock engine, could be good.

Loss of power for sure, but you'll never know until you change them.

As the others have said, I have seen 50-70 HP gain from the correct exhaust on N/A engines.

For the record I have been in the exhaust business for 50 some years.

 

these headers were really the only thing made back then 95 that i liked direct bolt on w/o mods they are coated so they still look mint but i have a new motor going together as we speak so i'm taking this one out i put this together the way i wanted it it was something reliable and some decent numbers i achieved what i wanted i know cam bigger headers bigger tpi thats what i'm doin with this motor thanks guys

 

Ok first thing: I would like to declare thread rape.

Second of all,
I think i have decided to go for it, with these heads, get them ported, new springs etc. , get a new cam, and maybe a set of used 2055's or perhaps Dyno Dons.


And for Dyno Don:
Would these headers be CARB approved? I would need them to be able to work with the vette heads and the vette style EGR.
How much for all of this list:

Headers with AIR and plate for egr, as well as an egr tube to work with the vette style egr?? shipping??

Thanks for all the input guys,
Boldguy

 

No, you cannot mix and match y-pipes and headers. They are a complete set and only work as a matched set. If you bought the 2055's you'd need to buy a dual-cat y-pipe for the 2055's. So I would suggest Dyno Don's headers as they come with a dual-cat y-pipe. No they're technically not CARB legal but just tell the smog guy they're SLP's or Hooker's or Edelbrock's and he'll never know.

This is my EGR setup when I was running Corvette heads:

https://www.thirdgen.org/forums/atta...s-dcp_0163.jpg

Those are Dyno Don's headers with a custom made EGR pipe.

 

ooooooooooooooooooooooo i get it!
Thanks that explains exactly what i was wanting!

So the pipe just goes from the passenger header to that flat baseplate on the pass side manifold and the EGR is directed through some port in the manifold to the location of the EGR (right under the plenum, i dont know if they are all like that, irrelivant).


Are there any set prices?? Any used that anyone knows about??