How did you hook it up. Did you have to buy a special TPI base or carb'd manifold. What about headers? Also, what years came with these heads?

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Rob
'86 TA 305 TPI

 

R.O.B.

What I understand of the 'Vette heads is that they accomplish an EGR system with an external tube, much like the LT1/LT4 family of engines.

All the above engines are emissions legal in their respective cars, so I wouldn't think it would be beyond the realm of possibility to meet standards with a retrofit.

If you are really serious about the conversion, you could use the external exhaust tube of custom plumbing from the exhaust to the EGR valve. All that would be required would be to drill/tap a hole for a fitting on the exhaust crossover of the intake to supply exhaust gas to the valve. Stainless steel tubing about 3/8" O.D. and a tube bender would make a pretty clean custom installation.

I know the aluminum heads were available after 1989, but I'm not sure about before then.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

First year was 86, on Corvette convertibles only. In 87 it was on the coupes as well. As for being 'legal' you would need to run exhaust to the EGR like Vader said, or pick up an aftermarket or Vette base which has the exhaust inlet for the EGR near the distributor. If you only have a sniffer check and they dont go under the hood to check the function, it is entirely possible to pass without the EGR, as I have done just that.

 

I live in Phoenix, AZ. Next worst thing to California's standards. I have visual, sniffer (idle and run speed), and they even check the gas tank and cap to insure its sealed.
I can probable get away with the visual though, they would never see the difference. Do you think I could still pass the sniffer without the EGR though?

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Rob
'86 TA 305 TPI

 

It should pass the pipe test.

We do functional in CA so it would fail that part but if you don't have that part of the test you should be alright.

A good running car will pass without EGR.


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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3

 

I passed without it in CA. In San Diego, NO ONE does the functional test.

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1989 IROC-Z 5.7L

 

Omar, I'm gonna visit you!!!!!!!

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...

 

The engine I'm building uses the Corvette heads with a tube off the #8 cylinder to the EGR port on the back of my TPIS Big Mouth intake manifold. I dont have pics of it yet, but it'll be installed next month. I copied the setup off a Corvette. You need to modify your exhaust manifolds or headers (I'm using SLP 1 3/4" headers) because the #8 tube doesnt have an AIR tube connected to it. It'll be the setup like Vader described.

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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
-=ICON Motorsports=-

 

Visual all Depends On the Mechanic Who is doing the test.

We Can get away with some stuff here, Basically everything has to be PLugged into Something.



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60 Ranchero - Project ( Money Hole )
85 Z28 LG4 - Daily Driver
**Mods**
MSD Superconductors
14" Open Element
KYB all around

 

Come on down..I will be waiting with the beer after you pass.

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1989 IROC-Z 5.7L

 

R.O.B.,

Check out "How About These Heads on My 305" on the TPI board. I give you all the information you'll need. I have Corvette aluminum heads on my 305 and I live in Tucson.

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://members.optushome.com/au/downunder1/rides/willie/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

 

G.M. part #10185077 is an emission-legal ZZ4 conversion kit for '82-'87 camaro. The GMPP catalog gives all the part numbers for the parts in the kit and might give you some ideas for your application. It is for carburated cars but the heads are still the corvette aluminum pieces.

 

Thanks guys!

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Rob
'86 TA 305 TPI