pontiac 455 engine specs gto

Conversely, an engine dyno measures torque and mathematically calculates horsepower from that. Zero to Sixty. Where are all of the decals & badges? By: Of course there was a time crunch so the word went out to every Southern California contact that I had and GTOAA member Mike Radke devoted considerable time to locating the Goats. Road Runner met a similar fate and its overall sales were by this time in a free fall. Light Em Up: Drag Racing, the HOT ROD Power Tour Way, What Is a Vista Cruiser? It was then sanded and painted with a two-part urethane custom mix that had flattener added until it was the correct 60 percent gloss. Your email address will not be published. Burton Bouwkamp wrote, The 1973 Charger sales increase was due to (1) good styling treatment in front end design and roof and quarter window ornamentation, (2) broadened marketing emphasis on Charger as high insurance rates limited the young buyer market, and (3) attractive pricing for the premium (SE) model.. So its been re-painted and debadged. They also installed a new Cordova top, using hard-to-find NOS material. As you'll see in the dyno chart, maximum horsepower was made at approximately 5,700 rpm and max . Inside, Pontiac tried to say to its clients that it was not only a sporty brand but also a luxurious one through the wood grain on the dash. His goal is to keep this GTO as stock as possible. The 455 GTO was rated at 360 hp, competitive with similar engines in the industry, but Pontiac didn't put much effort into making it the barnstormers that the LS6, Stage 1, and W-30 were. 25 Jun 2023 12:59:02 The addition options that were available were 2 new 455-CID V8s. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. Concerned about the coming transition to unleaded gasoline, and the reduced compression ratios associated with the switch, GM abandoned the project at the last minute in favor of the more traditional 455 engine. On the center stack, there was the stereo system and the climate control unit. The 455 engine offered more power and torque than the standard V8, making it a popular choice for performance-minded buyers. 327,631 Chevelle were sold, plus 59,108 station wagons. The 1965 GTO was announced by Pontiac in a press release on September 13, 1964. Dare to be different. Greg's Judge is fitted with a 4-speed trans and 4.11:1 gears in a Safe-T-Track rear. UCC Truck Show 2023: Maximum Performance Under Big-Time Pressure. 6.4-liter V8 engine, the . Compare that with 3600 for the W30. Though most of the pieces are still original, the seat covers, seat foam, carpet, and headliner were replaced with reproduction pieces sourced from Ames. While the engine family names are the same, the two engines have different dimensions and designs. Conclusion In the interior, there are small GTO badges on both doors, between the arm rest & window. Comp Cams makes a nice '067' replacement with 273/289-degrees advertised duration and 0.410/0.413 lift, and we used it to replace the factory stick.". Power is fed through a 4-speed trans to a 3.55 Safe-T-track rear. Those round-port heads were key in the development of the 1973 Super Duty 455, which replaced the 455 HO. One acknowledgement, which is more important to Lesiczka then his trophies, came from Pontiac historian John Sawruk, now deceased. At the front, it was available with two bucket seats, while the rear passengers could sit on a vinyl-covered bench. The door-panels featured the GTO badges on them. Then they glassbead-blasted the suspension components, primed them with SEM Self-Etching Primer, painted them with Satin Black, and reinstalled them on the painted frame. Unfortunately, in 1971, GM has switched its advertised engine ratings from gross figures to the more-realistic net numbers. He spent a weekend fixing these items, but before he knew it the engine and interior were completely out of the car. Renewed Style In keeping with its tendency toward modest mid-generation restylings, the 1970 GTO featured a number of aesthetic changes over the previous year. Block numbers 350, 400, or 455 were stamped on the left side of the blocks manufactured between 1970 and 1990. This 1965 Pontiac GTO Hardtop Sport Coupe has 54k original miles and was recently restored to its original condition. But perhaps the most important part of the 1970 model year was the body shape, which was much smoother than before. UCC Truck Show 2023: Maximum Performance Under Big-Time Pressure. Low-end torque was key because thats how people perceive performance. There was little interest in modifications. In 1973, the trademark Endura bumpers of the GTO were removed from the GTO because of federal regulations. A specific Pontiac grille and narrow headlights made a good impression at first sight. The side beltline was descending just to rise again in front of the rear fenders. 75 mm MAF, 75mm throttle body, 26 lb-hr injectors, Hyd. What Makes This 1949 Buick Sacramentos Best Custom of 2023? He kept one foot barely on the brake at all times, and so the GTO always had its brake lights on," Lesiczka said. It was paired as standard with a three-speed manual gearbox and an option for a four-speed. The 62-year-old Phoenix, Arizona, resident shared that winning Best of Show at the 2033 GTOAA Western Regional in San Pedro ranks as one of his most memorable moment with his H.O. Pontiac first equipped the GTO with a 455 cubic inch V8 engine in 1970. Furthermore, the claim in the 1971 Pontiac brochure backfired which declared that the engine produced more net horsepower than any other engine in its history. It was a long and sleek car for that muscle-car era. GTO, "I really love the look of a black '71 with a wing and I wanted a 455 H.O. The 455 H.O. They were functional when Ram Air was ordered. Afterwards, even though he was very ill with cancer, Sawruk took the time to lie underneath my GTO and personally inspect it. . For some younger folks who grew up with Pontiacs and Chevrolet sports cars sharing the same LS V8, it's wild to realize it was a whole different ballgame five decades ago. Unlike previous W30s, which were cammed out of sightas Oldsmobile expected owners to add headers and other mild mods to wake up the engine some moreOlds gave the automatic W30 a slightly milder cam that was more streetable. The Pontiac 455 is a large-block V8 engine that was produced from 1970-1976. Despite that, only 357 of The Judge were sold before it was finally decided to discontinue their production in February 1971. What made the GTO even more special were its optionsor lack thereof: 4.33 gears, gauges, manual steering, drum brakes, optional bench seat, radio-delete, and little else. We had a 2004 GTO to strip test in Southern California. The engines feature a cast-iron block and head and two valves per cylinder. shift knob. Under the hood, Pontiac offered the GTO with two engine versions: a 6.5-liter V8 and a mighty 7.5-liter V8, both being paired to a standard three-speed manual. Pontiac first equipped the GTO with a 455 cubic inch V8 engine in 1970. Even the Ram Air II 400 cubic inch V8 engine had a higher horsepower rating (366 hp). 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. was the fastest GTO that the division ever tested, so don't be fooled entirely by those lower compression and horsepower figures. Another beautiful Basil Classic.this 1970 Pontiac GTO has been handpicked and meets Joe Basil's standards of excellence and tradition of fine automobiles since 1951. "We hand-restored every component of the California smog system, including the gas tank, because no reproduction parts were available at the time," Lesiczka said. It seems more like a LeMans than a GTO if that makes any sense, but thats not a bad thing. It features a Ram Air III engine bored .030-over and is fitted with a Ram Air IV cam. Jun 12, 2021 For Sale 7 Comments 455 V8 4-Speed: 1970 Pontiac GTO Russ Dixon The GTO was the car that started it all - the muscle car craze of the 1960s. But what many people dont know is that in 1970, Pontiac made a historic move and put a 455 cubic inch V8 engine in the GTO, which made it one of the most powerful muscle cars of the era. Of course, Oldsmobile released the hounds for 1970 and offered the standard 455 for the 4-4-2 plus a W30 package with 370 horses. Chevrolet Chevelle Performance Statistics, Plymouth Barracuda Performance Statistics, The year 1973 is considered the end for the once great GTO, In 1973, the GTO was downsized due to the ongoing oil crisis. Those Rally IIs with white raised letter tires would look pretty sharp. Pontiac rated the 455 cubic inch V8 engine at 360 horsepower and 500 lb ft of torque. Save my name, email, and website in this browser for the next time I comment. 7.9 sec. Pontiac, Oldsmobile, and Buick each offered 455 cubic inch big block V8 engines in its muscle cars and full size models, but these engines didn't share any attributes other than their displacement. 71 convertible is a rare car that gets a lot of attention. For the 455, Pontiac expanded the cylinder bore to 4.152 inches and the stroke to 4.21 inches. The Journal . Also the power figures will be lower than you are used to seeing as compared to gross and net numbers at the flywheel. . Description. This was also to be the last year of the GTO as its own separate model. The '04 was making about 270 at 4,700 rpm and we haven't discussed the torque yet. GM also provided an option for a close-ratio four-speed manual. The outside look of the car marked a return to the horizontally-mounted twin-headlamps, unlike the 65 model, which featured the vertically-mounted ones. It has a displacement of 400 cu in (6.6 L) and a bore of 4.12 in (104.7 mm). However, it was rebuilt like the others and now features a .030 overbore and the most popular Pontiac swap ever--a Ram Air IV cam (1.50:1 rockers were retained). Quarter Mile. Additionally, a new SX package for the Cutlass Supreme came standard with the 320-horse 455 two-barrel, then was replaced in February 1970 by the 365-horse 455 (10.25:1 compression) from the big cars; optional was the 365-horse W32 455 (10.50:1 compression) that was identical to the standard engine for the 4-4-2. 455ci/250hp. Pontiac, though, is the exception. First, the owners are not actually performing the runs, which requires a lot of trust on their part since they have no control over what happens to their GTO on the dyno. See Chart Below for actual codes. The downsizing of the GTO was not very well received by the public and many mocked it as being the best looking Chevy Nova around. Pontiac GTO Coupe 455-4 V8 Turbo Hydra-Matic (aut. Engine Unit Number Why did Pontiac do this in such a seminal year? Heres Everything You Need to Know. The larger of these two motors graces the engine bay of this here GTO, for sale via Cerillo Motor Car Company in Clifton Park, New York, a suburb near Albany. Unfortunately for the seller, the buyer ended up not following through on the purchase, so the car is listed here on eBay with two days remaining in the auction. An example of data being processed may be a unique identifier stored in a cookie. Different years, I know. This GTO was ordered with a code 355 Saddle interior. Bringing the California-emissions smog equipment to show quality was a challenge. Heres Everything You Need to Know. This was true for all the 455s, from the 350-horse engine, standard on the GS 455, to the 370-horse engine available for big cars and the Riviera (though truth be told, the latter two were more or less identical in practice). Initially a mid-'69 super GTO to increase sales, the Judge returned for 1970 with a wild, free-standing spoiler and tri-tone "eyebrow" stripes that complemented the wheel bulges. The chassis rolls on date-coded 14x6 wheels with the correct XE code. The hidden headlight design was ditched in favor of four rounded headlamps set into deep bezels. AT THE DYNOSince we usually test engines on engine dynos and cars at the track, a few words regarding chassis dynos are required for this story. In any case, the 1971 GTO sported one of two colossal V8 engines. Sign up for the latest automotive news and videosin short, everything for people who love cars. After offering a solid run of 400/455-cu.in. However, their popularity seems to be decreasing day by day since the age old technology used in the engines make their use very unfeasible. A 4-speed transmission backs the engine and 3.07 gears are found in the Safe-T-Track rear. Although starting the decade off weak, Pontiac is to be commended for making the Dark Ages a little brighter through 1974. 8:71 BDS blown Butler Performance Pontiac on the dyno. But the GTO finally hit the showroom in North America in 2004. With the heads milled, as allowed under Pure Stock rules, the compression ratio is now just a hair under 12.0:1. This eliminates differences in torque converters and transmission gear ratios but rear gear ratios ranged from 3.07 to 3.46 to 3.55 to 4.11 so there is a variable and the tire heights were different for each model--another variable. First introduced in 1971, the 455 H.O. Until the 1970 model year, HO designated an entirely different set of credentials. At the same time, the AM/FM "Redeye" radio was restored and reinstalled. The trunk pan has rust holes and the exterior paint is faded and looks like it has been touched up with a rattle can. Peak torque is of course lower than the H.O.--39.98 ft-lb to be exact but its roughly 2 ft-lb better than the '04 GTO. The 1973 model were in existence, with some minor modifications, until 1979. Driving The Incredible McMurtry Spirling Fan Car | Henry Catchpole The Drivers Seat, EXCLUSIVE 992 GT3 RS vs Corvette Z06 vs BMW M4 CSL w/ Randy Pobst Cammisas Ultimate Lap Battle, With Pettys help, MN high schools will compete in kart build-off, Piston Slap: A symbol of death is this engines Forte, The second-gen Cadillac Seville went from international and chic to neoclassical and controversial. "We were able to hone the engine and reuse the 4.15-inch original pistons, grind the 4.21-inch crank 0.010/0.010, and only needed to buy a set of CAT connecting rods. "For the most part, we just had to clean it up and reinstall it." All The Torque The original 1970 Pontiac 455 'big block' V8 was good for between 360 and 370 horsepower and 500 lb-ft of torque. The end of an era. The factory exhaust manifolds are hooked to a reproduction exhaust system from Inline Tube. A code-1112012 Pontiac distributor (upgraded with an internal Pertronix unit) sends spark through datecoded-correct wires to AC Delco R45S plugs. From the front bumpers to the rear and inside the interior, this GTO is a fine ambassador for the twilight years of the first muscle car renaissance. Plymouth Road Runners 1973 model was sported with a completely new sheet metal with a more attractive styling that more closely resembled a four-door model. A 1971 GTO with the 455 CID V8, four-speed transmission, could accelerate from 0 60 mph at a time of 6.1 seconds and had a quarter mile acceleration of 13.4 seconds at 102 mph. This new option turned out to be a hit amongst the consumer, albeit for this year only. Why the all-new 1970 Firebirdintroduced mid-year due to a strikedidnt receive the 455 is another head-scratcher. was a logical progression of the 400 cubic-inch Ram Air IV. This show winner features a .030-over block with an aftermarket cam, 1.65:1 rockers and a slight increase in compression. Scott wired funds to the seller after an independent inspection gave Scott the green light (aside from a nonmatching motor), and the seller stored it until Scott returned from duty. Thankfully we had no detonation and no breakages for the duration of the test. Jody Haag in Pennsylvania rebuilt the close-ratio M21 transmission using the correct 661 case but upgraded to stronger M22 gears and fine-spline input for a bit more durability. The twin tailpipes on the driver's side sounded like a true, old-school, muscle car. It's not often that we can gather a group such as this in the same place at the same time for chassis dyno testing, in fact this is the first time. To improve the cooling, a wider grille was installed in the apron. The 455 GTO was rated at 360 hp, competitive with similar engines in the industry, but Pontiac didn't put much effort into making it the barnstormers that the LS6, Stage 1, and W-30 were. The plan was simple. "I saw things that I had never seen before on any Pontiac I have ever restored, including original spot welds, factory lap seams, and factory firewall markings. D-port mill, rated at 370 hp and offered for the first time in '70. Despite stricter emissions standards, the 455 High Output engine produced 290 horsepower, while the Super Duty, built in 1973, produced only 189 horsepower. Get new comment updates via email. ConclusionSo what did we prove with this test? The floor-mounted gearshift selector for the automatic transmission featured a wooden panel. This powerplant screamed on the dyno so with Greg's approval, Jason winged the D-port Ram Air to nearly 5,600 rpm were he felt the engine to begin to nose over. Jason Scudellari is the dyno operator and he was in charge of actually running each GTO and providing the charts that you see in this story. With all marketing efforts concentrated into earning the younger peoples attention, the GTO was also featured in movie, transforming it into a legendary vehicle. When the third-gen HEMI and the LS go to pasture soon, we'll say it ten times more. Regardless, it's a gorgeous GTO that will snap your neck and toast the tires forever. If you use the rule of thumb that power to the rear wheels is 15 to 20 percent less than net hp at the flywheel, the reading would have been 280-297.5 hp based on the 350hp rating. So gear ratios in the trans and rear, the converter stall speed and tire height will affect the output on a chassis dyno. This 1970 Pontiac GTO 455 came loaded with the options that make every Pontiac fan envious. It'll never be an E-Type Jaguar in the bends, but we're sure this GTO would take an E-Type to gapplebees in a drag race. Tom Burton's 455 H.O. Engine Used. Unlike the 1964 model, when the GTO was an option package, in 1970, it was a specific model, and it showed it not only on the outside but also on the drag-strip where it was a fierce contender. As a result of this, the leaded gasoline was banned and automakers had no choice but to shift from making powerful cars to those with lower emissions. Interior Jack in RI hit it. From there, a buyer could choose the Ram Air III at $168.51 (standard on the Judge) or the top-dog Ram Air IV at $558.20 (plus some mandatory equipment that added about $200 more). Hard to find some body and trim parts. Enabling new startups in the electric and hybrid vehicle industry, How Much Does The Pontiac Transport Weigh In Tons? Fuel is fed from a Rochester Quadrajet (code EES7040568, rebuilt by The Carb Doctor in Line Lexington, Pennsylvania) into a Pontiac dual-plane cast-iron intake (code 9799068). with air makes this a very special Pontiac to me." This phenomenon only drives up the price even further. 64 cast-iron heads, Foster also stayed as close to factory specs as he could. Technical Support:800.367.3245 1971 & 1972 455 HOs were 4 bolt mains, along with the SD-455s. Simply put, the GTO "deserved better than just a set of spark plugs and new wheel cylinders, pads, and shoes," he says. Other national awards include three consecutive Best of Shows at the World of Wheels (Boston, 2007-2009), as well as the event's coveted "Top Show Car" Crystal Award, and numerous other local and regional First Place accolades. 1973 Pontiac 455, two-bolt mains (YC-code), .030-inch overbore (462 ci), balanced, blueprinted for compression ratio and rod clearance, cylinders honed. It has a displacement of 455 cu in (7.5 L) and a bore of 4.15 in (105.4 mm). The car is being sold with no reserve and the engine is not operable. Power dropped somewhat on subsequent runs so we stopped at 4 (actually the 4th was thrown away). To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The mild mod 455 H.O. Afterwards, the men put the body on a rotisserie and sandblasted its bottom, followed by more priming and painting. Is it lower than the 2004? It was one of the most powerful engines of its time, and was even used in the legendary Pontiac GTO. Well we really weren't trying to prove anything. Compared to the 1970 GTO, the 1971 GTO had a pretty modest face list; it featured wire-mesh grilles accompanied with horizontal bumper bars on each side and the headlamps stacked more closely. GM had done well with what it had, but now the corporation could exploit high-performance in more competitive terms. Engine The men decided on a frame-off restoration with the intent of returning the GTO to how it looked when new. Too bad about the floors and non running 455 in an otherwise nice old car. Power is fed to the factory Turbo Hydra-Matic TH-400 four-speed manual transmission to an optional 12-bolt SafeTTrack limited-slip differential. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Made with for Muscle Cars - Musclecarfacts.com Copyright 2023. While in the beginning was just a package for the Tempest, the Pontiac GTO became one of the most notorious cars built by the GM-owned brand and a famed muscle car. The result of this was that it added fuel to the fire and the power and torque losses figures ended up looking even worse on paper. Slidell, Louisiana, native Scott Walters has been messing with muscle cars since 1984, favoring no single brand among the 30-odd cars he has owned. [CDATA[ document.write('x3Cscript type="text/javascript" charset="utf-8" src="https://adn.ebay.com/cb?programId=1&campId=5336214973&toolId=10026&keyword=1973 GTO&minPrice=1000&width=735&height=300&font=1&textColor=000000&linkColor=0000AA&arrowColor=8BBC01&color1=FFFFFF&color2=FFFFFF&format=Html&contentType=TEXT_AND_IMAGE&enableSearch=y&useeBayT=y&usePopularSearches=n&freeShipping=n&topRatedSeller=n&itemsWithPayPal=n&descriptionSearch=n&showKwCatLink=n&excludeCatId=&excludeKeyword=&catId=&disWithin=200&ctx=n&flashEnabled=' + isFlashEnabled + '&pageTitle=' + _epn__pageTitle + '&cachebuster=' + (Math.floor(Math.random() * 10000000 )) + '">x3C/script>' ); It has a displacement of 455 cu in (7.5 L) and a bore of 4.15 in (105.4 mm). With 10.5 compression, it put out 370 hp at 5,500 rpm and 445 lb-ft of peak torque at 3,900. In 1970, General Motors removed the limit altogether. '70 Judge 400 RAM AIR III Gregg Miller's '70 Judge runs a Ram Air III engine. Please check the link at the bottom of todays article to view all the actual vehicles nominated for this months Ride of the Month.

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