Modern Rodding Tech
InTheGarageMedia.com
Close-up of a white radiator cover
1. This radiator cover is a classic example of how adding the right amount of detail can truly enhance the look of reworked panels. It has just enough complexity to appear interesting, without coming across as “busy” or “cluttered.”
The Right Amount of Detail
Roadster Shop Turns Out a 1970 Chevelle
By Ron Covell Photography by Chris Gray & Elia Daoud
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hen building a car, decisions are made at every step of the process that affect the look of the finished project. Some cars have a very simple design, while others incorporate so much detail that it can be overwhelming.

It can be challenging to know how much detail to add, so today we’re looking at an example of a 1970 Chevelle built at Roadster Shop. We believe it has just the right amount of detail for this type of hot rod build.

The original Chevelle had a large open area between the grille and the radiator, and when the hood was open, it looked quite utilitarian. The first step in refining this area was to create a simple panel with a single lateral step. Although this was a significant improvement, the Roadster Shop team believed the panel would have a far more interesting look if a series of shallow indentations were added, giving the panel a “ribbed” appearance. While this kind of fabrication requires time and skill to execute, we think you’ll appreciate how this treatment transformed the panel into a real accent piece—one of the first things to catch your eye when the hood is opened.

The original grille on this car had trim made from fragile aluminum channel, which featured overlapping joints between the pieces. It’s very challenging to get this type of trim to fit together precisely, so the team decided to machine their own trim from steel billet, allowing the sections to be welded together, which provides the trim with significantly more strength and a cleaner appearance.

The new trim pieces were designed using CAD and milled on a CNC machining center, which produced parts with very close tolerances. These pieces were carefully fitted together on a special jig, ensuring that alignment was maintained during the welding and metal finishing processes.

The car will have an electric fan on the rear of the radiator, and a custom shroud has been designed to fit around it. Shrouds need to fit closely to the fan blades to operate efficiently, so care was taken to ensure a good fit during the fabrication of this part. While a simple band of metal would have sufficed, the crew added strengthening flanges to both the front and rear edges of the ring, along with a couple of beads around the perimeter—providing additional strength and tasteful style.

Another small detail was added for plates that fit around the hood pins. These plates are typically screwed to the surface of the hood, protecting the paint from being marred by the clips inserted through the pins to ensure the hood can’t pop open unexpectedly. To create this recess, special tooling was made to emboss a circular indentation in scrap pieces of metal. These were then fitted into the hood, welded, and finished. Again, this small detail makes a noticeable improvement in the appearance of this feature.

We hope these tips will provide some ideas for refining the details of your next project.

close-up of a partially restored car's front end, showing the area behind the grille
2. The Chevelle originally featured a large opening in the panel just behind the grille. It does not appear very clean, and it allows air to bypass the radiator.
custom-fabricated metal panel installed above the grille
3. The first step was to create a panel that covered the large opening, featuring a stepped detail that ties in with the other underhood panels.
Overhead photo of a metal panel being fabricated
4. A careful layout was created for the areas to be recessed, leaving a pleasing ribbed pattern in the panel.
center recess being welded into place
5. The two rear recesses are complete, and the center recess is being welded into place.
panel with finished recess metal
6. With the recessed metal finished, you can see how nicely this panel accentuates the underhood area.
close-up of radiator cap
7. Access is required for the radiator cap. A hole with a flared edge is carefully fitted to snugly surround the cap, adding another pleasing detail.
solid stock added to leading edge of panel
8. A strip of 1/8-inch solid stock is added to the leading edge of this panel to blend in with the trim on the grille.
primer applied to metal panel
9. With some primer applied to the panel, you can better appreciate its form, fit, and finish. Take note of the snug fit and flowing lines of the seams where the panels join.
3D render of a car grille assembly
10. The original trim for the grille was in poor shape. This trim is a thin aluminum extrusion and is very difficult to fit with precision. A decision was made to replace the trim with channels machined from solid steel stock.
3D CAD model in bright orange and gray on a turquoise background, showing a cross-section of a curved channel with mounting tabs.
11. The new trim pieces were designed using CAD so they could be machined to close tolerances.
three CNC-machined aluminum plates with intricate, U-shaped channels, exposed bolt holes, and visible tool marks
12. These are a few trim pieces undergoing machining. A support structure is required to securely hold the delicate pieces as they are milled.
Two finished, U-shaped metal pieces
13. When the support structure is removed, you can appreciate the precise shape of these parts and the crisp edges.
A custom-fabricated steel grille frame component in a shop holding the trim pieces in alignment
14. A temporary fixture was created to hold the trim pieces in alignment while they are welded together and smoothed.
tape holding trim in place
15. The new trim is temporarily held in place with tape while the fit is checked.
fan shroud mock-up
16. The chipboard is used to create a mock-up of a fan shroud for the back of the radiator.
circular aluminum fan shroud
17. The shroud consists of a ring of aluminum sheet, with the flanges on the edges curved using a stretching machine.
red fan shroud
18. Beads are rolled into the shroud to add strength and style.
finished fabrication on fan shroud
19. With the fabrication finished on the shroud, it serves as another accent underhood.
a custom square sheet metal plate with a circular recess where a four-hole mounting flange (for a hood pin) is fitted.
20. Hood pins are often used on high-performance cars, and a reinforcing plate is usually screwed to the hood for the pin to go through. Here, a sheetmetal blank has been given a uniform recess for the plate to fit into, giving it a more finished look.
a recessed circular plate with holes for a hood pin
21. Here, the blank has been welded into the hood and metal finished.
finished chrome hood pin
22. With the final paint on the car and the quick release pin and plate polished, you can see how this subtle recess adds a finishing touch to this detail of the car.
SOURCE
Modern Rodding
VOLUME 6 • ISSUE 63 • 2025