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Here are the differences between an 88 intake and an 89 intake. As you can see from the number of holes, there is one extra hole on the end of the 88 manifold for EGR exhaust gas. This can be easily plugged. If you want to leave the EGR valve off, you will have to plug the two holes where it sat. The EGR opens at highway speeds to send exhaust gas back into the combustion chambers. On the 88 manifold, it is a tiny round hole at the back of the intake manifold. On the 89 manifold, it is a fancy curved dam shape. Someone must have done extensive flow bench testing.
The most noticeable difference is that the intake ports are much smaller on the 88 than the 89. Also the carb base is about a half an inch lower.
The runner length is longer on the 88. I would guess that the air velocity is a lot higher. Does anyone have a vacuum gauge? Please check both years. I would bet the 88 should pull slightly higher vacuum.
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The last two pictures are from a Hitachi dual carb setup I bought off eBay from Australia. I will have to fabricate an intake manifold from foam. I will glue the foam together with low temp hot melt, attach a sprue, then dip it in a ceramic slurry. Once the slurry has dried, I will shake sand around it for support and then pour molten aluminum onto the exposed foam in the sprue. The styrofoam will vaporize, then the maching is the final step.
I made an intake manifold once before for the Chevy 2.8 V-6 engine.
It was superior to the stock manifold and was dynoed and raced in Nevada by Macpherson. I still have the patterns.
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The most noticeable difference is that the intake ports are much smaller on the 88 than the 89. Also the carb base is about a half an inch lower.
The runner length is longer on the 88. I would guess that the air velocity is a lot higher. Does anyone have a vacuum gauge? Please check both years. I would bet the 88 should pull slightly higher vacuum.
[img]
[/img]
[img]
[/img]
[img]
[/img]
[img]
The last two pictures are from a Hitachi dual carb setup I bought off eBay from Australia. I will have to fabricate an intake manifold from foam. I will glue the foam together with low temp hot melt, attach a sprue, then dip it in a ceramic slurry. Once the slurry has dried, I will shake sand around it for support and then pour molten aluminum onto the exposed foam in the sprue. The styrofoam will vaporize, then the maching is the final step.
I made an intake manifold once before for the Chevy 2.8 V-6 engine.
It was superior to the stock manifold and was dynoed and raced in Nevada by Macpherson. I still have the patterns.
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