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In 1967 the 421 was enlarged to 426.61 cu in (7.0 L) by increasing its bore to 4.12 in (104.6 mm). Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It retained the 421's 4 in (101.6 mm) stroke and 3 + 1 ⁄ 4 in (82.6 mm) main journal.
Heads used on the high performance 409 and 427 engines had larger ports and valves than those used on the 348 and the base 409 passenger car and truck engines, but externally were identical to the standard units – but for the location of the engine oil dipstick, on the driver's side on the 348 and the passenger's on the 409/427.
Being nearly identical, it too has the distinctive odd-sided hexagonal shape. These engines can be fitted in rear wheel drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model engine swaps. All Cadillac Northstar V8s; Oldsmobile Aurora L47 V8; GM 3.5L LX5 "Short Star" V6
Introduced in 1963 on Pontiac's 389 and 421 cu in (6.4 and 6.9 L) drag racing engines, General Motors fitted it to the 1967 Z/28 before they used it on the L88 427 cu in (7.0 L) Corvette. It eliminated the production breaker-point ignition allowing greater spark energy and more stable ignition timing at all engine speeds including idle.
As Chevrolets under the skin, Canadian Pontiacs including the Parisienne used the same engines and transmissions as full-size Chevys, including the 230 and 250 cubic inch 6 cylinder and 283, 307, 327, 350, 396, 400, 409, 427 and 454 cu inch V8s. These engines were mated to the same transmissions as Chevrolet, including 3 and 4 speed manual and ...
For 1958, GMC reduced the bore of Pontiac's 370-cubic-inch (6.1 L) to 3.875 in (98.4 mm), resulting in a displacement of 336-cubic-inch (5.5 L). (In Canada, however, GMC used the Chevrolet small-block engine rather than the Pontiac.) For 1959, as the Pontiac engine's stroke was lengthened to 3.75 in (95.3 mm), a further bore reduction to 3.78 ...
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1963-engines were available in 415 and 425 horsepower versions. 1964 was the final year of the Max Wedge option. The engine for the third year was named the "Stage III." Max Wedge cars equipped with four-speed transmissions were only produced in the final year, as prior to that point Chrysler did not have a manual transmission that could handle ...
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