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

What size screws for this plenum cover

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Old Nov 2, 2017 | 09:15 AM
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Default What size screws for this plenum cover

The intake manifold plenum extension (85-91)

The aluminum cover that goes over the distributor?

I'm pretty sure they are metric.

Thanks,



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Old Nov 2, 2017 | 09:24 AM
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M4x.7x13 I believe is correct sizing.

Buy and try locally!!

Last edited by WVZR-1; Nov 2, 2017 at 09:27 AM.
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Old Nov 2, 2017 | 09:27 AM
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Quoting from a post from another forum:

"If you're going to the hardware store to get them, the plenum extension screws are M4 x 0.7, 10mm long, Button head Torx with a funky captive washer."
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Old Nov 2, 2017 | 11:08 AM
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Originally Posted by don hall
Quoting from a post from another forum:

"If you're going to the hardware store to get them, the plenum extension screws are M4 x 0.7, 10mm long, Button head Torx with a funky captive washer."



How about these ... should be OK right? I'm not paying $7 a screw from GM.
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Old Nov 2, 2017 | 11:56 AM
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https://www.accu.co.uk/en/torx-butto...SABEgIeSPD_BwE
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Old Nov 3, 2017 | 08:55 AM
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http://www.parts123.com/corvettecent...050f&ukey=5544

FWIW, corvette central has the correct screw set. $5. problem is S&H -



I have in the past replaced mine with allen head cap screws from the local hardware store - M4-0.7 X 12mm - seems to me I paid less than $1 for 3 screws.


Last edited by Joe C; Nov 3, 2017 at 09:08 AM.
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Old Aug 22, 2024 | 01:09 PM
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Does anyone know what exactly is the Torx NUMBER for these bolts/screws? Nobody seems to ever mention the number? In videos, my vette manual, nothing...
I don't have a Torx set, and, before buying one, just want to be sure I get the right set.
Thanks.
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Old Aug 22, 2024 | 01:21 PM
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They appear to be T10 torxheads.
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T10 torx
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Old Aug 22, 2024 | 06:13 PM
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Thanks!
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