The 327/375 FI engine was always a Corvette only engine.
The highest HP 327 engine available in full sized Chevrolets in 65 was the 327/300, itself a sleeper as it was underrated.
Higher HP 327 engines produced HP at higher RPMs and were cammed to do so. Manifold vacuum was deemed unsuitable for vacuum accessories and low/mid range engine torque was unsuitable for automatic transmissions, most common in Impalas.
The 409 was sold in 1965 Chevrolets until January (February?) when the 396 became available. The 400 HP rating was the same as the HP (big head) 64 version with a single 650 CFM Carter AVS (AFB) carburetor. GM dropped the 2X4 (425 HP) option in 1964, though quite a few were retrofitted.
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Today's Featured Article - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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