In our March issue, we covered the process of swapping our '58 project car's crud-loaded stock gas tank for a fresh replacement unit from Corvette Central. While that operation alone would likely have vanquished the severe fuel-delivery problems that landed the Vette in the shop to begin with, we decided to press on to the engine compartment this month and install a modern high- performance carb-and-intake combo.
As we noted previously, the C1's original 283 had long since been jettisoned in favor of a high-performance 406 SBC topped with a Holley four-barrel and an Edelbrock Performer intake manifold. While this pairing remained fully operational, the car's new owner was keen to install something with a little more performance potential and visual pizzazz. Inspiration ultimately struck while he was thumbing through some vintage drag-racing photography, and a plan was hatched: We would assemble a full dual-quad setup inspired by the early competition Vettes of the mid-to-late '50s.
When we shared this approach with our man at Summit Racing Equipment catalog, he suggested that we remove any potentially ruinous guesswork from the equation by installing Edelbrock's Performer RPM Dual Quad Air-Gap Kit (PN EDL-20254, $1,299.95). This all-encompassing package includes an RPM Dual Quad Air-Gap intake, two 500-cfm Thunder Series AVS carburetors, a throttle linkage, fuel lines, and intake-manifold gaskets. It's available in Edelbrock's chrome-like EnduraShine coating (which we selected) as well as in a standard finish treatment.
As you'll see in the accompanying photos, the project hit a temporary snag when a preliminary test fit revealed the Performer RPM setup to be too tall to fit under the C1's factory hood. Since the car's owner was disinclined to install a bulged aftermarket bonnet for clearance, we scoured the Summit catalog for a suitable intake alternative.
We eventually settled on an Edelbrock C-26 Dual Quad unit (PN 54254, $379.95), a proven design that, while less aggressively configured than the Performer RPM piece, should produce excellent performance and driveability atop our C1's moderately modded stroker engine. Though it was conceived back in the '60s, the low-profile C-26 is currently available to fit both standard SBC heads (like ours) and the later-model Vortec configuration.
While this is a fairly straightforward job, our dual-quad setup does require a few configuration-specific installation and setup procedures. We'll cover those—along with the rest of the job—in the accompanying photos.