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The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800 cu ft/min (23 m 3 /min) Rochester Quadra-jet carburetor with specific jetting. The 1971 455 HO was rated at 335 hp (250 kW) at 4,800 rpm and 480 lb⋅ft (651 N⋅m) of torque at 3,200 rpm ( gross ).
Engine selection saw the addition of Pontiac’s largest V8, the 455, available in the L75 325 hp (242 kW) version and the LS5 335 hp (250 kW) HO version. Both the 455 and 455 HO were available as engine options for the Firebird Formula, but the Trans Am received the 455 HO as standard equipment.
The Catalina continued as Pontiac's entry-level full-size automobile with a Buick-built 231 cubic-inch V6 now standard in sedans and coupes (Safari wagons came standard with V8 power) and optional V8s of 301 CID, 350 CID and 400 CID displacements, each Pontiac-built engines and offered in all states except California. The Pontiac 350 was ...
As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" RPO W72 with a single four-barrel 800CFM Rochester Quadrajet carburettor rated at 200 bhp (203 PS; 149 kW) at 3,600 rpm and a maximum torque of 325 lb⋅ft (441 N⋅m) at 2,400 rpm, as opposed to the regular "6.6 Litre" 400 (RPO L78 ...
In mid-March 1971, a second design change for the GT-37 switched the striping to a reflective sword-style stripe sometimes referred to as the 1971 ½ GT-37. 1971 also afforded the customer the opportunity to choose any of Pontiac's optional V8s such as 350, 400, or 455 cubic inch models, including the 455 High Output (HO) engine. The 455 had ...
The motorhome had a front-wheel-drive transaxle, which GM called the Unitized Power Package, originally used in the Oldsmobile Toronado and Cadillac Eldorado with an Oldsmobile 455 cu in (7.5 L) V8 from the Toronado. In mid-1977 the engine was downsized to a 403 cu in (6.6 L) V8.
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The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.