1972 Pontiac 455 HO 335hp Pontiac, Pontiac firebird, Motor engine

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In 1968 Oldsmobile debuted the Rocket 455, an engine that was part of a family of 3 (with 400 and 425 cubic inch engines sharing a similar architecture). Offering between 310 and 400hp, and pushing out a spectacular 500 lb-ft of torque, the 455 big block was most famously used in the 442 muscle car.

Photo 07 1970 Pontiac GTO 455 HO passengerside engine and carb detail

1972 Pontiac GTO 455 H/O specs, 0-60, quarter mile, engine specifications, pictures, updated July 2023.

1972 Pontiac 455 HO 335hp Pontiac, Pontiac firebird, Motor engine

The Pontiac V8 engine is a family of overhead valve 90° V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. The engines feature a cast-iron block and head and two valves per cylinder.

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The 455 Pontiac V8 was introduced in 1970 and provided large-bodied Pontiacs a torque-friendly engine. Prominently featured in the Pontiac Bonneville, the 455 was also used in the GTO, Trans Am, and the Firebird. The 455 was an improvement on the Pontiac 428 V8. High Output and Super Duty versions of the 455 were added in succeeding years.

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The 1970 to 1971 Pontiac 455 generated 325 and 455 foot-pounds of torque. The 455 High Output generated 335 horsepower and 480 foot-pounds of torque for 1970 and 1971. However, power steadily declined beginning in 1972 when Pontiac reduced it to 300 horsepower and 415 foot-pounds of torque. In 1973, a 250-horsepower 455 with 370 foot-pounds of.

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To Paul Lesiczka, a 45-year-old union sheetmetal worker in Plaistow, New Hampshire, the City by the Bay instantly brings to mind a three-number/three-letter combination: 455 GTO. "My '70 GTO was.

Mildly Modifying Pontiac’s 455 H.O. To Add Nearly 100 hp Over Factory

While the exterior decals denoted that it was a 455 cubic inch engine, the HO designation was only seen on the build sheet. Pontiac rated the 455 cubic inch V8 engine at 360 horsepower and 500 lb ft of torque. The 455 cubic inch engine horsepower rating was surprisingly low compared to the torque it delivered.

phscollectorcarworld On the Block 1971 Pontiac GTO 455 HO convertible

Pontiac built the engine for the 1970-1976 model years, where it produced a maximum of 370 horsepower and 500 lb-ft of torque. It was the biggest engine that Pontiac ever produced, and rivaled the Buick 455, Chevy 454, and Oldsmobile Rocket 455, as the top of the line General Motors' muscle car offerings.

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455 H.O. Engine Fix-Up - Part 2 Assembly and Dyno Testing - A simple rebuild that improves the performance and reliability of our 455 H.O. Related Video. Rocky Rotella writer. Jan 24, 2014.

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Pop the hood, and the 455 HO was not like the previous year's 455 HO: It shared displacement, the 068 high-lift cam, an open Shaker scoop, and a deep-breathing Rochester Q-Jet atop an aluminum intake manifold, but little else. New '72-only oval-port heads, casting number 7F6, wore 2.11/1.77-inch valves and had huge 111-cc chambers.

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The 1972 455 H.O. 7F6 cylinder heads with oversized intake ports and round-shaped exhaust ports were completely rebuilt using bronze valveguides, stainless-steel Ferrea valves in 2.11/1.77-inch,.

Photo 06 1970 Pontiac GTO 455 HO driver's side engine compartment air

Breaking the mold of muscle car ownership with a 1971 Pontiac GTO 455 H.O. Matt Litwin 09/23/2018 Muscle Cars In This Article Category: Muscle Cars We'll cut right to the chase and tell you that William and Jamie Bell buck conventional opinions when it comes to the car-collecting hobby.

Mildly Modifying Pontiac’s 455 H.O. To Add Nearly 100 hp Over Factory

Of the three 455 cubic inch V8 engines offered by General Motors in 1970, the Pontiac 455 took the most unusual route to the market. Unlike Oldsmobile and Buick, which had both big block and small block engines on the shelf, Pontiac had been developing the same eight-cylinder formula since 1955.

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Personale giovane e dinamico, ho istallato con loro le grate di sicurezza e sono stati davvero veloci con prez. - Mario Librandi Read More. Send Message. VIA MILANO N.52, 22070 BREGNANO Como, Italy. Martino1930. Con oltre 15 anni di esperienza nella progettazione e realizzazione di elementi in acciaio per l'interior design,.

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In fact, the 455 engine in the '75 455 HO Trans Am was identical to the 455 engine you'd get if you ordered a '75 Catalina station wagon. Compression ratio was 7.6 to 1. It had no special internal components whatsoever and was rated a measly 200 hp at 3,500 RPM and 330 lb.ft. of torque at 2,000 RPM.

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Mark Gittelman Updated on 12/23/18 There's no question that 455 cubic inches of displacement equal a big motor. Nevertheless, this giant engine from the General is a little mysterious. In the beginning, you would find them in Oldsmobile Motor Division products.