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We were anxious to drop in the Real Fine 509 (December '09 issue)-which dyno tested at 669 hp at 6,000 and 623 lb-ft of torque at 4,500 rpm-into the Nova. Unfortunately, header (2 1/8-inch Hooker Super Competition) and tall valve cover clearance issues required us to remove and reinstall it a few times to sort out the fitment issues. If we elected to use the smaller 2-inch Hooker Super Competition headers (or TCI's 2-inch big-block headers) and shorter valve covers, fitment issues would be non-existent. We've seen other Novas ('68-74) and early Camaros using 2-inch Hookers with the TCI tubular front clip, but we didn't want to chance losing any power.