Explain these to me.

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Dec 24, 2024 | 09:33 AM

#21

Cam33

Racer

Joined: Dec 2022

Posts: 301

Likes: 87

Quote:

Originally Posted by jr73

Had my 68 since I was 20 but it didn’t look like this till I restored it.

if a car came with A/C what was the reason why GM still put the vents in rear deck

Dec 24, 2024 | 09:40 AM

#22

Cam33

Racer

Joined: Dec 2022

Posts: 301

Likes: 87

Quote:

Originally Posted by Corey_68

Yep, all '68-'75 C3s have Astro Ventilation on the windows, no matter if it was functioning or not.

my 70 has all original date coded glass and there is no Astro ventilation written anywhere

Dec 24, 2024 | 09:48 AM

#23

Newbomb2469

Safety Car

Joined: Nov 2023

Posts: 3,868

Likes: 837

2025 c3 ('74-'82) of the Year Finalist - Unmodified

My ‘75 does not have it either

Dec 24, 2024 | 06:41 PM

#24

loup68

Melting Slicks

Joined: Jan 2012

Posts: 3,039

Likes: 504

From: myrtle beach sc

Army

Cam33, they would have had to block off the rear deck vents with fiberglass and that would have not only added time and labor to the build, and made the chance for the fiberglass to mess up down the road. They were not about to make two different bodies, one for A/C and one without it. Lou.

Dec 25, 2024 | 07:04 PM

#25

Corey_68

Team Owner

Joined: Feb 1999

Posts: 34,454

Likes: 665

From: Republic of Texas

Quote:

Originally Posted by Cam33

my 70 has all original date coded glass and there is no Astro ventilation written anywhere

Yeah it sounds like somewhere along the way a previous owner changed the glass with replacement date coded glass. Many of the Corvette Parts houses offer replacement glass with date codes and optional Astro Ventilation Script. According to Chevrolet, the Astro Ventilation script on windows was standard on all C3's ( they didn't make separate windows). NCRS judges have said some late 74 and some 75's did not have the AS as they were phasing out the windows for the '76 model. Some 75s were said to be delivered with one driver side window with the AS script and the passenger side without. Quality control was not a priority back them.

https://www.topflightautomotive.com/...ory-date-code/

Dec 26, 2024 | 10:55 AM

#26

Cam33

Racer

Joined: Dec 2022

Posts: 301

Likes: 87

Quote:

Originally Posted by Corey_68

https://www.topflightautomotive.com/...ory-date-code/

true possibly the glass was changed at some point.. . Good point on the 75 . My friend has a 75 AC car which his dad purchased new and has no ventilation on the windows

Dec 27, 2024 | 05:26 PM

#27

jr73

Thread Starter

Drifting

Joined: Apr 2013

Posts: 1,750

Likes: 268

From: Central Wisconsin

There is a chance that if the drain hoses for these which drain into the wheel wells deteriorate and spring a leak would leak water into the interior.
Right? 😬😧

Dec 27, 2024 | 05:46 PM

#28

loup68

Melting Slicks

Joined: Jan 2012

Posts: 3,039

Likes: 504

From: myrtle beach sc

Army

Yes. Lou.

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Dec 29, 2024 | 08:49 PM

#29

jr73

Thread Starter

Drifting

Joined: Apr 2013

Posts: 1,750

Likes: 268

From: Central Wisconsin

Well since my car is far from stock
(yet not custom) and they have no function as mine is an AC car I’m gonna glass over them. I’ll fill the opening with glass mat. I just want a clean look.

Last edited by jr73; Jan 1, 2025 at 01:50 PM.