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Old 07-10-2021, 4:01pm   #1
mrvette
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Default Need a pix of an L98 intake manifold

preferably off the car, naked, no dizzy/runners, plenum.....rear section, interested in the water plumbing,

Thanks
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Old 07-10-2021, 4:12pm   #2
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You Tube is your friend also
Google it


https://sdparts.com/i-23896057-sdpc-...baseplate.html
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Old 07-10-2021, 5:08pm   #3
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Thanks, but none of the pix I have found in manuals, decades old, or pix on .net tell me what I need to know.....that is about the rear passages of the cyl haads....they blocked off at the intake manifolds, apparently.....or is there some other trick I not aware of???

I have had a huge problem with my 350 /L98 headed engine, and am wondering if I didn't screw up with returning the water......

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Old 07-10-2021, 5:38pm   #4
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Gene.
Just either Google your exact question, or use U-Tube the same way.
Actually, have the better half do it for you

https://www.thirdgen.org/forums/fabr...ines-rear.html

or

https://www.corvetteforum.com/forums...-question.html

Read the entire thread
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Old 07-11-2021, 7:20am   #5
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Quote:
Originally Posted by mrvette View Post
Thanks, but none of the pix I have found in manuals, decades old, or pix on .net tell me what I need to know.....that is about the rear passages of the cyl haads....they blocked off at the intake manifolds, apparently.....or is there some other trick I not aware of???

I have had a huge problem with my 350 /L98 headed engine, and am wondering if I didn't screw up with returning the water......

Too bad I didn't see this earlier.
Just had my '85 L98 off yesterday due to water leak on rear passenger side.
Both left and right rear water passages have a water restrictor plate that fits into the manifold head gasket opening to cover the head water passages. The plates have a ~1/8" drill hole in them that allows/restricts water into the rear of the manifold.
The manifold openings on my '85 are a small ~1/2" deep blocked pocket - water does not circulate thru the back intake pockets. If the plates are not installed correctly in the gasket (fits inside a channel around the plate), water leakage galore!!
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Old 07-11-2021, 7:43am   #6
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Far as I remember from the install years ago, I was told to drill two ~1/8" holes in the gaskets, they were made for total blockage of those rear passages, and so I drilled and made two outlets on the modified intake manifold, and plumbed them forward so to circulate the water......after the issue, upon pulling the head, all 4 cyl had water in them......head gasket looked tired, but no clear failure indication....same with intake gasket......

but upon reading the other threads suggested above, It's a common issue....
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Old 07-11-2021, 7:52am   #7
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Just slap it back together and beat the piss out of it like it's meant to be.
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Old 07-11-2021, 9:29am   #8
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Time for an LS swap...
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Old 07-11-2021, 11:47am   #9
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Time for an LS swap...
With my arthrongus and age/muscles these daze, It's all I can do to fix this one, although I would have done an LS had they been so cheap and plentiful and the junkyards.....23 years ago.....
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