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

Lt1 / l98!

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Old Jun 28, 2011 | 10:18 AM
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Default Lt1 / l98!

I need an expert. I have a feeling I am going to get a myriad of answers for what, at first, seems like a simple questio: Will a LT1 oil cap fit on a L98 engine?
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Old Jun 28, 2011 | 10:28 AM
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NO the LT1 valve covers are a composite... and threaded oil cap
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Old Jun 28, 2011 | 11:02 AM
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Originally Posted by THE 383 admiral
NO the LT1 valve covers are a composite... and threaded oil cap
Correct. The L98 covers have the metal cap with 2 tangs. It's a 90 turn to lock.
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Old Jun 28, 2011 | 12:36 PM
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Thank you
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Old Jun 28, 2011 | 12:50 PM
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My '88 L98 has a screw in cap on the stock covers.
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Old Jun 28, 2011 | 02:39 PM
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Originally Posted by Aardwolf
My '88 L98 has a screw in cap on the stock covers.
that's with a adapter correct..... and not common!!!
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Old Jun 28, 2011 | 02:54 PM
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Originally Posted by Aardwolf
My '88 L98 has a screw in cap on the stock covers.
How is that possible Aardwolf?
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Old Jun 28, 2011 | 03:15 PM
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Stock as far as I know. No adapter. I've had the car a long time and the guy I bought it from is not mechanically inclined. When I changed the intake all the parts looked stock. Pic:

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Old Jun 29, 2011 | 08:01 AM
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Gentlemen we have stumbled on to something!! Great pic.
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Old Jun 29, 2011 | 08:19 AM
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Not a Fluke My 37k original 89 is exactly like yours.


Originally Posted by Aardwolf
Stock as far as I know. No adapter. I've had the car a long time and the guy I bought it from is not mechanically inclined. When I changed the intake all the parts looked stock. Pic:

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Old Jun 30, 2011 | 12:49 AM
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pls go look at you LT-1 cap again.... what threads???!
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Old Jun 30, 2011 | 02:29 AM
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Originally Posted by Aardwolf
My '88 L98 has a screw in cap on the stock covers.
All three of my 88's have a screw cap.
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Old Jun 30, 2011 | 08:10 AM
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Originally Posted by Vetster88
All three of my 88's have a screw cap.
All 3? Now your just showin off!
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Old Jun 30, 2011 | 09:34 AM
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Depends upon the year of the L98. All centerbolt valve covers for the L98 have screw in oil caps. the centerbolt valve covers started on some 1986 vette's and all 1987 and later vette's.
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Old Jun 30, 2011 | 09:38 AM
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My 87 has a 1/4 turn cap No threads. My late 86 did too. Maybe they went to screw in with the 113 heads ??
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Old Jun 30, 2011 | 10:09 AM
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My "91" L98 has the screw in oil cap.
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Old Jun 30, 2011 | 10:15 AM
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Originally Posted by bjankuski
Depends upon the year of the L98. All centerbolt valve covers for the L98 have screw in oil caps. the centerbolt valve covers started on some 1986 vette's and all 1987 and later vette's.
Originally Posted by JackDidley
My 87 has a 1/4 turn cap No threads. My late 86 did too. Maybe they went to screw in with the 113 heads ??
Ok, apparently I am incorrect. The 113 head change seems to make sense. That change happened in 1988.

Question does the 1987 vette have alum valve covers or steel valve covers?
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Old Jun 30, 2011 | 10:22 AM
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Originally Posted by bjankuski
Ok, apparently I am incorrect. The 113 head change seems to make sense. That change happened in 1988.

Question does the 1987 vette have alum valve covers or steel valve covers?
Magnesium valve covers.
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Old Jun 30, 2011 | 11:33 AM
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My 88 has a 90* twist on.
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Old Jun 30, 2011 | 01:06 PM
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Originally Posted by JackDidley
My 87 has a 1/4 turn cap No threads. My late 86 did too. Maybe they went to screw in with the 113 heads ??
What are "113" heads?
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