L98 Plenum and Runner help
Thread Starter
Burning Brakes
Joined: Jul 2012
Posts: 895
Likes: 91
From: Poughkeepsie, NY
L98 Plenum and Runner help
Looking to pick up another set of runners and plenum to polish.
Are they interchangeable? I have a 1989 with casting #10108468.
Ebay has plenty available, with casting #s 10077151 and 14081006 but not mine.
What are the differences?
Are they interchangeable? I have a 1989 with casting #10108468.
Ebay has plenty available, with casting #s 10077151 and 14081006 but not mine.
What are the differences?
Last edited by 89dd; Jun 28, 2015 at 05:14 PM.
Race Director
Joined: Feb 2003
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From: Kingman AZ
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Pretty good article from Hot Rod Magazine. A Google search will bring you much more.
http://www.hotrod.com/how-to/engine/...lassic-chevys/
http://www.hotrod.com/how-to/engine/...lassic-chevys/
Safety Car
Joined: Jan 2014
Posts: 4,017
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From: Poughkeepsie New York
Race Director
Joined: Aug 2000
Posts: 11,470
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Pretty good article from Hot Rod Magazine. A Google search will bring you much more.
http://www.hotrod.com/how-to/engine/...lassic-chevys/
http://www.hotrod.com/how-to/engine/...lassic-chevys/
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
If I'm remembering correctly the 89 plenum was a 1 year only item....85-88 had cold start injector, 90-91 was speed density..I believe you can plug the cold start injector hole to use it on the 89, but you may want to check first to make sure..WW
Last edited by WW7; Jun 28, 2015 at 08:11 AM.
Instructor
Joined: Jan 2015
Posts: 207
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Just FYI. I just got done polishing my 86' Plenum and runners. I made the mistake of sending the stock Magnesium valve covers out as well. If the 89's are Magnesium as well, don't bother! The Plenum and runners look fantastic. But the Magnesium turns real quick. PITA. I just bought a set of quality covers to replace them.
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Thread Starter
Burning Brakes
Joined: Jul 2012
Posts: 895
Likes: 91
From: Poughkeepsie, NY
Just FYI. I just got done polishing my 86' Plenum and runners. I made the mistake of sending the stock Magnesium valve covers out as well. If the 89's are Magnesium as well, don't bother! The Plenum and runners look fantastic. But the Magnesium turns real quick. PITA. I just bought a set of quality covers to replace them.
Look smoking hot, but now the runners and plenum need some love.
Wanted to pick up another set so I can still drive the car then bolt on the polished set when finished.
PS
Thanks to corvetteronw and Dt86 for the helpful articles.