I want to add Edelbrock TES headers and probably their cat-back system to my car, with a Compcams 212-218 duration @.05 with lift around .447-.467. As well as 1.5 ratio roller rockers. How much horsepower chould this add to my car? Also, will the nickel plated headers stay in good condition, or will they turn some funky color?

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1986 Metallic Blue IROC-Z
80k miles, 305 TPI
Mods:
-Edelbrock Hi-Flow baseplate
-Dynomax Cat-back
-gutted MAF
-K&N's
-airfoil
-shiftkit

 

Edelcrock TES are the worst headers you can get for these cars. I'd highly recomend you spend the extra $$$ for the SLPs. Not only are they a superior design (more power), they are also stainless so they'll never rot.
As for gains, 3 tenths and 3 mph would be the minimum i would expect out of them.

If you look over the exhaust board, this debate has been beaten to death many times. 99% of folks who have seen/used both designs would NEVER run the edelcrocks again. Including me.

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.7 @ 93.6
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

i just got some used slp's 1 3/4 headers and they are stainless and look really good. the stainless metal is very hard to port even with a carbide bit though



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1986 Iroc 305 small block chevy getting modded now for speed

 

Ed...I would think that you would know better than to make broad sweeping statements like "Edelbrock is the worst you can get" for our cars.

I know of several other brands that are far "worse" than the Edelbrocks. My Edelbrocks were well made, and fit with no engine lifting or other "tricks" that some people found necessary.

As For a 1 5/8" header...the Edelbrock is very nice. You cant really compare the 1 3/4" SLP....that is like comparing apples to oranges.... It doesnt work.

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Mike Metzler (Desert86Roc)[*] Check Out:SpeedWorldMotorplex.com[*] Check Out:Chevrolet F-Body Online Part & Illustration Manual[*] www.MetzlerRacing.com

Best ET @ 1250 ft[*] 15.352 @ 91.215 mph (uncorrected)

 

Ya i heard you have to like lift the engine to get the Slps in. is that true. My friend said it took them 3 hours to tighten one bolt on a 91 Z. And they had to make a special wrech to get the spark plugs out.

 

Headers suck, we all know this.

I'm running flowtech headers.. They fit pretty good actually. The rear 4 plugs have to be taken out with an open end wrench, but I have a lift so its no big deal.

Now I like some SLP stuff. Their runners seem to work pretty good. I just wish the metal inside was more smooth..

-- Joe


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1989 Formula 350 4-bolt mains, Forged .030 TRW pistons, SLP 51010 Roller Cam, Comp-cams roller lifters, Summit 1.5 roller rockers, World Products Sportsman II
2.02/1.60 heads, Edelbrock TPI Intake, Cloyes Double Roller, timing chain, Mellings oil pump: 13.5 @ 100.23 MPH

Since close of track : Ported SLP runners, Ported Plenum, AFPR, Autometer 100lbs gauge, A/F ratio gauge.

http://www.joesperformance.com

-- Joe