Reinforcing the Inner Structure of a 1965 Corvette

By Ron Covell   –   Images by Roadster Shop

Roadster Shop has developed a reputation for building street machines at the highest level, and in the next few issues we’ll be taking a close look at a stunning 1965 Corvette they are building for Brad Whitt.

002 1965 Corvette rear body mock up primer finish bumper delete test fit
The lower rear body panel was removed to facilitate modifications.

Since Corvettes are made with fiberglass bodies, the construction techniques on this project differ from what you’d see on metal-bodied cars. Even though the material is different, the fit and finish will be held to the same exacting standards as all Roadster Shop builds.

003 1965 Corvette taillight housing fabrication dual round pod openings
The bumpers will be tucked in closer to the body, so the bumper mounts were trimmed and smoothed.

As with many projects of this caliber, a rendering was commissioned to set the direction from the start. Chris Gray, Roadster Shop’s lead designer, produced the rendering, and although the body modifications are subtle, extraordinary care will be taken to perfect the fit and finish of every panel and component.

004 1965 Corvette rear panel metalwork custom lower valance shaping
The stock exhaust outlets were filled, and a new underbody exhaust system will be fabricated.

The 1965 Corvette had optional side pipes, yet all cars produced had openings in the rear panel for the stock exhaust system. One of the first modifications was to fill the original exhaust outlets beneath the rear bumper. To facilitate this work, the rear body panel was removed and the bumper mounting surfaces were smoothed and downsized so the bumpers could be tucked in closer to the body.

005 1965 Corvette bumper area smoothing taillight pocket refinement
The firewall required extensive modifications. Installing the new pedal assembly required a reinforced mounting surface. Here, the old firewall has been partially cut away.

The brakes on this 60-year-old car have been upgraded with modern Wilwood master cylinders for both the brakes and clutch, which required reinforcing and slightly extending the original fiberglass firewall. Baer calipers were used. A baseplate for the master cylinders was fabricated from aluminum, bonded to the firewall, then encapsulated in fiberglass mat and resin. Both sides were carefully smoothed so that once painted the modifications will blend in seamlessly.

006 1965 Corvette firewall cut out structural modification for engine clearance
A sturdy framework was fabricated from thick aluminum plate to support the steering column and pedal assembly.

A new climate-control system from Vintage Air was installed under the dash, which required some modifications to provide clearance for the vent and defroster ducts. The entire dash was scanned to ensure accurate placement of components, and a new glovebox shell was fabricated from aluminum sheet to fit snugly into place.

007 1965 Corvette custom firewall panel riveted aluminum reinforcement
The mounting bracket was finish-welded and smoothed off the car.

The original floor behind the seats was removed, along with the wheelwells, and replaced with Roadster Shop–developed composite panels. These provide room for the new independent suspension and will accommodate a 345 tire.

008 1965 Corvette fabricated firewall plate CNC cut openings
The bracket was positioned, then bonded permanently to the fiberglass firewall with new layers of mat and resin.

On the driver side, the footwell was extended and reconfigured in a manner that Roadster Shop has developed following several Corvette builds. This provides badly needed room and comfort. The original structure was cut away, and a temporary form was created from aluminum sheet and fastened in position. Clay was used to make uniform fillets in the corners, and new fiberglass was laid up against the form. Once cured, the aluminum was removed and all surfaces were blended smooth.

009 1965 Corvette firewall box mock up exhaust pass through tube
Openings were cut for the master cylinders and mounting bolts.

The transmission tunnel also required extensive modifications to clear the Bowler T56 transmission, though the original console bezel was retained. Careful fitting ensured the bezel and dash panel lined up cleanly, maintaining the integrity of the original design.

Check out this story in our digital edition here.

010 1965 Corvette dash 3D scan digital interior mapping for restoration
The dashboard required modification to accept the Vintage Air climate-control system and ducting. A digital scan ensured accurate placement of components.
011 1965 Corvette dash framework install with HVAC mock up and taped wiring pass throughs
The climate-control unit was carefully fitted into place beneath the dash fascia.
012 1965 Corvette glovebox reinforcement with welded aluminum inner panel
A new metal glovebox liner was fabricated to clear the climate-control components.
013 1965 Corvette rear floor pan rebuild with fiberglass metal blend and underside smoothing
The rear floor panel was replaced with a new Roadster Shop-developed composite panel, along with their oversize wheelwell arches.
014 1965 Corvette rear interior tub with wheel arch shaping and structural bonding
Looking inside the cabin, you can see how snugly the new panels fit.
015 1965 Corvette driveshaft tunnel mock up with polished panels and cleco fasteners
Portions of the under-seat floor area required patching. Metal plates were temporarily installed to form a base for the new fiberglass laminations.
016 1965 Corvette footwell fabrication with aluminum patch panel test fit
An entirely new driver’s footwell was built; providing additional room, making the driver considerably more comfortable. Aluminum sheet was used as a form for the new fiberglass layup.
017 1965 Corvette front floor pan layout with tape guides for shaping
Modeling clay was used to smooth the corners before the fiberglass was laid up.
018 1965 Corvette pedal box area with aluminum firewall and modern pedal mounts
With the aluminum form removed, the new footwell blends neatly into the existing floor.
019 1965 Corvette transmission tunnel with sheet metal shaping and alignment check
The transmission tunnel was cut open to make room for the Bowler T56 transmission.
020 1965 Corvette interior floor structure with smoothed pans and dash bracing
A new tunnel top was fitted, ensuring proper alignment with the center dash panel.
021 1965 Corvette console mock up with manual shifter plate and tunnel reshaping
The console bezel was test-fitted, showing that some adjustments will be required.
022 1965 Corvette tunnel patterning with paper templates and floor pan layout
Paper templates were made to refine the transition between the upper and lower portions of the transmission tunnel.
023 1965 Corvette fiberglass floor pan formed with blended reinforcement zones
A look inside the cabin as the extensive fiberglass work neared completion. The repairs and modifications blend smoothly with the original panels.

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