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Double Your Displacement: The Great 455 Swap
Maybe the only limitation of the Edelbrock Performer RPM heads is the round-port header requirement. Combined with the added complexity of the clutch linkage, we wondered if we shouldn’t just run stock manifolds on this thing. But we’d heard that Doug’s Headers for this application fit great, and speaking with Mr. Thorley himself confirmed that. Naturally, though, we had a few reservations when Doug told us they’d “drop right in.” The headers themselves are a work of art. Between the heavy-gauge flanges, 1-7/8-inch primaries, full-flanged 3-1/2-inch collectors, and brilliant ceramic coating, they almost look too nice to install. We had Doug’s weld oxygen sensor bungs in each collector (arrows) to accommodate an anticipated EFI conversion. View Related Article
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