C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Plenum, runners & manifold

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Old Mar 21, 2015 | 11:34 PM
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Default Plenum, runners & manifold

The Plenum aside, not sure what to do there.

but what are some thoughts on these 2 set ups for my '89 vette.

http://www.ebay.com/itm/391028661292?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

and

http://www.ebay.com/itm/161613814542?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Thanks
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Old Mar 22, 2015 | 03:26 PM
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..... Take a look at the FIRST Fuel Injection Intake before you buy the Edelbrock stuff ... FIRST Flows more air and includes a large mono-blade throttle body ...........
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Old Mar 22, 2015 | 05:34 PM
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Just wanted to say that the second item is runners only and they are part of the kit in the first item. The base pictured is not included with the runners.
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Old Mar 24, 2015 | 11:41 AM
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Originally Posted by HlhnEast
Just wanted to say that the second item is runners only and they are part of the kit in the first item. The base pictured is not included with the runners.
Thanks...
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Old Mar 24, 2015 | 11:45 AM
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I am seriously considering the F.I.R.S.T unit, it looks like it comes with everything other than a fuel regulator

71mm TB Is that over kill. I'm doing intake, cam/lifter/roller rockers, LT1 exhaust manifolds into Y-pipe, hi-flow cat and Borla catback system.

Thoughts?
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Old Mar 24, 2015 | 08:41 PM
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Originally Posted by Hawk196
I am seriously considering the F.I.R.S.T unit, it looks like it comes with everything other than a fuel regulator

71mm TB Is that over kill. I'm doing intake, cam/lifter/roller rockers, LT1 exhaust manifolds into Y-pipe, hi-flow cat and Borla catback system.

Thoughts?
The FIRST set up is a great upgrade. You will also have to change your distributor to a small cap unit if I understand correctly.
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Old Mar 24, 2015 | 09:07 PM
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Originally Posted by HlhnEast
The FIRST set up is a great upgrade. You will also have to change your distributor to a small cap unit if I understand correctly.
Just out of curiosity , with cat back magnaflows and open air filter , how much H.P./TOURQUE would that first setup add on to my 1988 L98 ? would it lose its bottom end power?
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Old Mar 25, 2015 | 06:13 AM
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Originally Posted by 88-VETTE-L98
Just out of curiosity , with cat back magnaflows and open air filter , how much H.P./TOURQUE would that first setup add on to my 1988 L98 ? would it lose its bottom end power?
Those two mods will help some but real measurable differences start when you modify the engine i.e. performance heads, cam, intake manifold, runners as the OP was asking about. It takes some research to carefully match components with each other and to what you want to accomplish. The easiest performance adder would be a set of long tube headers and free flowing exhaust system.

The principle to remember is an engine is a big air pump. Air in-air out. Any restriction is power loss. More cfm air in thru an aftermarket intake, runners and throttle body must be matched thru larger intake and exhaust valve heads. Then it has to flow out an unrestricted exhaust system. You will gain some with each improvement but until all mods are completed you will not realize the full potential of your engine.

Good luck!
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Old Mar 25, 2015 | 10:24 AM
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Here's some reading for you ....WW

http://xtremecarzone.com.au/index.php?showtopic=386.
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Last edited by WW7; Mar 25, 2015 at 10:27 AM.
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Old Mar 25, 2015 | 12:41 PM
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Originally Posted by 88-VETTE-L98
Just out of curiosity , with cat back magnaflows and open air filter , how much H.P./TOURQUE would that first setup add on to my 1988 L98 ? would it lose its bottom end power?


https://www.corvetteforum.com/forums...first-tpi.html


Somewhere in the first few pages of this thread is a chart that will answer your question.
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Old Mar 25, 2015 | 01:37 PM
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not much difference in the price Summit offers. Figure free shipping in..
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