Pontiac GTA Enhancement information and discussions with Technical DIY and performance tuning information for the hardcore Pontiac GTA Owners and Enthusiasts.
Forum | Register Now | Members | Search | How Do I... | Calendar

Go Back   The GTA Source Page Message Forums > GTA SPECIFIC > GTA TECH

GTA TECH Want to discuss technical topics about your GTA.... engine tuning, mechanical upgrades, problem areas, etc.? Then post it HERE!

Thread Tools Display Modes
Old 4 Weeks Ago   #1
Darthscooby1001's Avatar
Join Date: Feb 2013
Location: Germany
Posts: 18

GTA Year: 1989
GTA Engine: 350 TPI Automatic
Corvette Heads swap

Hi guys,

I have the chance to pick up a set of Ali heads from a 90 C4 Vette. My car is an 89 GTA 350 and both motors are L98. I have tried to do a little research first but getting confused, I would just like to know if they will fit, i.e. bolt straight on or if it is a waste of time. I am going to pull my engine over the winter anyway to clean it up so this would be a convenient time to change them. Your help and advice appreciated.

Darthscooby1001 is offline   Reply With Quote
Old 3 Weeks Ago   #2
Registered User
Join Date: Oct 2012
Location: IN
Posts: 552

Re: Corvette Heads swap

Years ago I had these. They bolt right up. I can't remember if I had problems with the angle plugs though. When I bought my AFRs, I went with the straight plugs but I can't recall why...

They're an OK head. Just don't pay to much for them. Hopefully you're getting a great deal or I'd save and buy an aftermarket set.
1991 GTA, SLP Perfomance Package
1989 GTA, 26K Original Miles
1988 GTA, Stock
86TA355SR is offline   Reply With Quote
Old 3 Weeks Ago   #3
Registered User
DynoDave's Avatar
Join Date: Mar 2015
Posts: 259

Re: Corvette Heads swap

Don't forget the EGR difference.

Read this.

1988 Pontiac Trans Am
POCI #72200
DynoDave is offline   Reply With Quote
Old 2 Weeks Ago   #4
Hopefully soon to be restored Third Gen owner.
Join Date: Apr 2016
Location: Pacifica, CA
Posts: 251

Re: Corvette Heads swap

Originally Posted by DynoDave View Post
Don't forget the EGR difference.

Read this.

Interesting setup on that Vette. But looking at the pix in that link, it doesn't appear that this suspect EGR tube connects directly into the head. If that's the case, the Vette heads probably would just bolt directly to the block on your Pontiac. Would valve size matter between applications, from a Vette to a Pontiac, in the event that the valves are of a different size between the two? I got another question, would the Vette heads require a specific size of piston in order to provide it's full performance potential compared to the pistons that come in the Pontiac? I got a feeling that if the heads are changed to increase the engine's overall performance, the pistons would also need to be changed out as well. Could be other things within the valvetrain.

Last edited by JonBlake; 2 Weeks Ago at 12:01 PM.
JonBlake is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Heads 87GTACKO GTA TECH 22 03-14-2012 08:56 AM
113 corvette almunium or 906 vor tec soarestransam19 GTA TECH 4 03-09-2012 07:40 AM
Trick Flow Heads or Edelbrock or...?? WickdEye GTA TECH 3 02-29-2012 11:59 AM
stock heads junk wildbird GTA TECH 22 05-26-2008 09:29 PM
Corvette L98 Alum heads 88BlackGTA GTA TECH 9 04-04-2002 02:10 AM

All times are GMT -5. The time now is 08:58 AM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.