C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Oct 8, 2025 | 08:05 PM
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Nice work!
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Old Oct 9, 2025 | 02:09 PM
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Thanks!

It was a good starting point for repairing the car, and I’m happy with the results.
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Old Oct 9, 2025 | 04:55 PM
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Since the consensus is DEI, and…
1. Economy
2. No adhesive
3. Decent insulation

I’m gonna try out the 50110 BoomMat.
DEI claims 85% heat absorption, and…

” Where to use:
  • Floor pans
  • Fire walls
  • Transmission tunnels
  • Behind back seats
  • Inner fender wells
  • Trunk floors
  • Rear quarter panels
  • Under headliners
  • Kick panels “

Also bought a roll of the 10408 Cool Tape to seal the exposed edges of the polyester / fiberglass 50110, and secure to the floor as need be.

It’ll take a while for me to say how well it works - Seattle Fall is on the way, and I still have an oil pan & radiator to install.

BTW… I would have preferred no adhesive, but I think there’s no escaping something to hold it down. That’s why I opted for tape.
And I’ll make sure to lay out a template before cutting.
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Old Oct 10, 2025 | 05:35 PM
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Alright, guys.
If you’re following this thread…

I’m in the process of making the template for the trans tunnel interior. Good thing I have plenty of cardboard lying around…

Since the molded foam shield/seal/doo-dad for the bellhousing-to-body is currently unavailable, I bought some Duck Brand pipe insulation.

The engine needs a good degreasing, so I’m not sweating sacrificial 2” pipe insulation* wrapped in DEI foil tape as a short-term substitution.

[*mentioned on the forum as a “quick-fix” for the bellhousing-to-body seal … we'll see how it works wrapped in foil tape.]

Next big thought, important info I’ve spent time researching in the next post…

…to be continued!
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Old Oct 10, 2025 | 06:00 PM
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For all of what I’ve read here, and everything I went through with my squarebody Suburban…

It’s been said so many times before, but the entire point of a radiator fan is to remove heat from the engine compartment.

It does that in two ways:
1) pull air through the radiator to keep the engine cool (relatively)
2) push engine compartment air out and away from the car

#2 is a critical factor. It’s why the trans tunnel seal, radiator seals, air dam, and fender/firewall ‘splash’ shields were installed.

Once the heat has been removed from the radiator, it still needs to be evacuated from the engine compartment.

I was able to do this on the Suburban with a [better than OEM] fan, and REMOVING some undershielding - she don’t have louvered fenders like a C3 … and sits higher, with a better CFM mechanical fan. [Still hits ~210° at the hottest, 190° thermostat, 454 swap, larger radiator, no issues so far.]

We’ve got these beautiful roadsters, practically sitting on the ground, so - yeah - get that heat out through the fender louvers/vents/gills/etc.. and if the triangular shields are in good shape & flow correctly, heat removed.

Block/shield/seal the trans tunnel and force that hot air down and away, through the louvers or down-out under the car. Whatever it takes to keep the fiberglass from absorbing any heat.

I’m still on the fence about whether electric fans can perform #2, knowing darn well that they’ll take care of #1.

Thanks for reading - I just wanted to reiterate the importance of the 2 functions of a radiator fan.
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