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Thread: 1976 Corvette Stingray 496... Reply to Thread
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Topic Review (Newest First)
07-16-2019 05:17 PM
76-Vetteman A little bit of inspiration for this build.


A couple of small videos at the bottom of thread #1
https://www.pro-touring.com/threads/...-touring-build

And a 76'.
Scroll down in the information window for many photos and a short video

http://hebonline.hu/heb.php?page=C3C5Corvette
06-26-2019 11:48 AM
76-Vetteman Just adding a few photos today


This is a simple photo of C6 - Z51 front and rear suspension cradles sitting on the bench, looking top down. You can find cradle assemblies from a number of yards across the country. You will find varying prices for them. Some vendors do a better job of cleaning and packaging, some, not so much. Some vendors offer free shipping included and others require freight.


My front cradle assembly came from Florida, it was cleaned well, and I paid freight. The rear cradle assembly came from Michigan, it was kinda' dirty but shipping included. In the end all the parts cleaned up well and free of damage.











This photo is the front cradle with the upper frame rails attached. The view is from the rear looking forward. You can easily see the cradle mounting perch points on the driver side, and you can see the frame front and rear attach points. Each cradle perch is cast and machined to a specific dimension. Likewise, the frame attach weldments are jigged and welded in place during the frame build to specific dimension. When the cradle and the frame are mated together on the line there are no shims required.












This photo is of the cradle and frame rail, passenger side, forward looking right. At the bottom of the photo you can clearly see the lower control arm mounting bolts. Directly above you can see the upper control arm mounting pockets. And between them you can see the upper shock mount pocket. The Upper and lower control arms, and the knuckle are cast aluminum or magnesium and machined to a specific dimension. And when they are assembled together with the cradle and the upper frame rail, they form the desired geometry for the corvette. And this design and assembly method is so good, rarely after assembly is extensive alignment required.
Yes, the bonding epoxy can be broken off, but I'm sure it won't be a lot of fun.


06-26-2019 11:02 AM
76-Vetteman Yep, saw that one coming. The rear deck will have to be raised. And I'm sure the boxes behind the seats are gone too. I'm just worried that the bellhousing for the transmission will wind up being my right arm rest
06-25-2019 04:53 PM
autowiz
Quote:
Originally Posted by slofut View Post
Vetteman,
At the local Moultrie Automotive Swap Meet twice a year, there is a guy that has complete rolling c6 suspensions for sale. It always looks inviting to me to put a c3 body on that suspension. But he also has custom frames there built to combine both. Really nice quality too.
Quote:
Originally Posted by 76-Vetteman View Post
slofut- It would be interesting to see a complete C6 rolling chassis. Wish I had the bucks to invest in a system like that. Sure would save a lot of time on a build. Perhaps I can get to the event sometime soon.

https://www.digitalcorvettes.com/for...d.php?t=278842

We got that frame and a few others here:
https://www.streetshopinc.com/

The c5,c6,c7 rear suspension has upper a-arms and the rear frame rails need to tuck in the same as for a back half chassis car. This means modifications to the floors in the rear they gotta be raised. Not the end of the world but definitely food for thought.
06-25-2019 04:42 PM
76-Vetteman slofut- It would be interesting to see a complete C6 rolling chassis. Wish I had the bucks to invest in a system like that. Sure would save a lot of time on a build. Perhaps I can get to the event sometime soon.


So this is my first shot at posting some kind of photo. If it works, Great. If not - well, we'll try again.


Just a couple of screen shots of the engine stand from my 3D program. One in perspective view. The other just a side view. The side view indicate where the engine mount rotational center is raised up above the crankshaft centerline. This should distribute the weight a little more evenly and provide an easier rotational effort.
The base is large, as the stand will fill multiple roles. It will be modified later to act as a test stand; where the engine will be mated to the transmission and tested together.




06-25-2019 04:30 PM
autowiz
Quote:
Originally Posted by Marks76ray View Post
I haven't touched it in 2 years, took a long break i have however restored a pontoon boat and completed it last week so it's not like I have been sitting around. I am however about out of projects and am getting the itch to start back on the vette.
I will keep an eye out for updates on your thread. That is such an awesome project you have.
06-25-2019 12:04 PM
slofut Vetteman,
At the local Moultrie Automotive Swap Meet twice a year, there is a guy that has complete rolling c6 suspensions for sale. It always looks inviting to me to put a c3 body on that suspension. But he also has custom frames there built to combine both. Really nice quality too.

Here's a link, if you're close at the time it's a great weekend hunt too.


http://www.moultrieswapmeet.com
06-24-2019 06:21 PM
Marks76ray
Quote:
Originally Posted by autowiz View Post
Speaking of 496, How's your 76 doing these days?
I haven't touched it in 2 years, took a long break i have however restored a pontoon boat and completed it last week so it's not like I have been sitting around. I am however about out of projects and am getting the itch to start back on the vette.
06-24-2019 05:15 PM
76-Vetteman Marks76, Brent, 1963SS, thanks for the comments.


Ambitious yes, and perhaps a bit overwhelming too. I've never taken on an auto project of this magnitude, so we'll see where this project goes.



The chassis: I am really excited to make this chassis conversion. This conversion is not about increasing value, but more about improving the cars ride, feel, driving experience, whatever you want to call it. I don't want this car to drive or ride as poorly as it did in '76. I don't want the crappy seats, scorching hot floor boards, or the awful air conditioning. So I'm trying to bring improved engineering and technology to one of the most beautiful Corvette body styles built.



The engine stand: All the material for the engine stand is in the shop and has been cut. There are a couple of plates that require machining. I'll get that done next week when I'm home. Most engine stands are configured with a pipe in a sleeve that is welded to a plate with arms that mount to the bellhousing. The unfortunate part of this configuration is that the mount plate rotational axis is near the crankshaft rotation axis. This stand places most of the engine weight above the rotational axis of the stand, making it quite difficult as 1963SS points out to roll the engine. So I've built a mounting plate that allow the repositioning of the engine on the stand, thus moving the center of gravity of the engine to a more favorable position. My stand with geared assembly, if balanced properly one should be able to easily rotate the engine with a 'speed wrench and socket, or with a 3/8" cordless drill motor and socket. The geared assembly has an internal lock so when the drive socket is removed the drive shaft locks. No magic here. I've seen variation of what I'm trying to build out there on the wild internet...


The transmission: Maniacmechanic1 and autowiz posted their comments about the 6L80. Their comments are correct. Perhaps the best choice for the 496 is the 4L80 transmission. But I don't like the 4L class transmissions; I've had a number of them over the years with varied success. Because the 6L80 is a little marginal for the 496, I am now looking into a 6L90 or an 8L90. Either can handle the 496 given my style of driving. Thanks Maniacmechanic1 and autowiz for your comments.


Thanks all again for your comments and valuable information.
Pictures coming, as soon as I get posting procedures down!!



BillT
06-24-2019 04:27 PM
autowiz
Quote:
Originally Posted by Marks76ray View Post
Good to see you follow through with the 496. One of the things that I have not encountered yet with mine is hood clearance. I have measured and it will be real close but until the body is back on, there is no way to know if there is enough clearance. With that sheet metal intake from Raylar it's going to give you a challenge. The way I look at things there is nothing I can't over come given enough time. I have been working on several projects and hope to get back on the Vette this fall. Ill be following your build very interesting approach using the C6 parts.
Speaking of 496, How's your 76 doing these days?
06-24-2019 04:25 PM
autowiz I can't wait to see this project moving along. Don't forget the pictures, whatever you do!
06-23-2019 09:04 PM
1963SS
Quote:
This special stand will allow the heavy 496 to rotate 360 degrees easily.
I bought a gear driven stand from Jegs…..or Summitt. I could never seem to get the balance right and wound up working myself to death just rotating the damn thing. Good choice. I'd like to throw the crank away on mine and use a flexplate/ring gear and a very slow starter or something. Lifelong electrician. I can figure something out.
06-23-2019 07:53 PM
brent319 wow, that is very ambitious! keep us posted on your progress. This should be fun to watch...
06-15-2019 09:11 AM
Marks76ray Good to see you follow through with the 496. One of the things that I have not encountered yet with mine is hood clearance. I have measured and it will be real close but until the body is back on, there is no way to know if there is enough clearance. With that sheet metal intake from Raylar it's going to give you a challenge. The way I look at things there is nothing I can't over come given enough time. I have been working on several projects and hope to get back on the Vette this fall. Ill be following your build very interesting approach using the C6 parts.
06-15-2019 08:39 AM
76-Vetteman
Change of plan - this C3 goes C6

Hi guys,


It's time for an update!!


A year ago, I thought I knew where this restomod was going. The plan was to use the 496 Vortec, the 6L80, and to upgrade the rear end with new components. The suspension, steering, brakes and literally everything else would be rebuilt. Body and frame modifications for the 496 and the 6L80 would be required. And of course a redesign of the interior.


But over the last year I have given much more thought to the '76, and realize the original build plan to refresh a lot of C3 stuff, just would not work for me. And so I've decided on a new build plan, to build the '76 around C6 suspension components and other C6 and later technologies.


The negative side of this restomod is the extensive work, specifically to the body and frame that must be done. The positive side are the suspension gains that GM engineering bring forward over a 30 year span, 1976 to 2006.


The 496 is still the power plant, that has not changed. But a lot of steel parts will be replaced with lighter components where possible. The heavy truck intake, though it is aluminum will be replaced with a billet/sheet metal, perhaps composite manifold. She will be treated to a dose of Raylar engineering. The heads are here and they are beautiful !


The 6L80 will be rear mounted on the transaxle like the C6 to aid with weight distribution.


First things first, however... A new engine stand will be built for the 496. This special stand will allow the heavy 496 to rotate 360 degrees easily. We'll build it together here at DC, and the plans will be made available to all. Coming very soon.


Please follow along with me through this process.
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