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Placing the H&H/Navarro dual-carb tooling insert atop a standard cross-ram (thanks to Bob Mosher for the loan) offers a glimpse of what the few Navarro quad carb castings looked like. We're still wondering about the rest of the manifold casting. The similarity with Chrysler castings suggests some level of collaboration between Navarro and Chrysler. But first hand accounts from ex-Chrysler engineers nix the theory (see sidebar).