Clones have popped up from time to time, and unscrupulous sellers might not do all their research before claiming they have an original SD-455 Firebird. Not only did the SD-455 have the goods to match the hype, when properly configured to reach its true engineered capability the engine was reported to be an absolute monster. In 1967 Pontiac made some open chamber heads(i.e. 1-q-73 Plug Wires Pontiac Sd-455 Super Duty Sd 455 T/a Trans Am Firebird Formula. Pontiac Cylinder Head ID Numbers. As new NOS. Protecting the health & safety of our customers and ourselves is our number one priority. Proudly made in the USA!! Bringing the Traditional Pontiac V8 Engine into the 21st Century through modern innovative design and state of the art machining We'll send you the most interesting Street Muscle articles, news, car features, and videos every week. Buy It Now. In 1973, the Ventura got the Pontiac 350 instead of the 307; in 1975, it got an Olds-built 260. The SD-455 Trans Am rattled the cages of entry-level European sports cars, all for just $5,500. We have a great online selection at the lowest prices with Fast & Free shipping on many items! First edition Pontiac Trans Am SD-455s are rarely spotted in the wild today, which isn't surprising considering that just 252 were built for the 1973 model year. New and used items, cars, real estate, jobs, services, vacation rentals and more virtually anywhere in Ontario. I run a stock QJet carb. The 1974 SD 455, maybe close to the 1970 RA IV , so the 1974 SD 455 came with a milder Cam and 290 SAE net horse power , some stuffs between these two engines are the same , The Heads and the Camshaft and ... and the 74 sd455 came with 8.4 compression , but the RAIV came with 10.8 . $30.00 each or $25.00 with any parts order. For the 1973 model year, 43 Firebird Formulas received the SD-455 and only 10 of them were paired with the 4-speed. Year 1973. This cam was designed with RA/HO exhaust manifolds in mind and gives up very little performance with the manifolds over a 4 tube header. #485225. Custom-Ported Pontiac Cylinder Heads: At Nitemare Performance, we only build and modify pure Pontiacs with traditional Pontiac engines — the legendary 326-455 cubic inch V8s produced from 1964 through 1980. SD Performance has spent an extensive amount of time on the dyno, at the track and on the street to develop some of the best performing Pontiac ported cylinder heads on the market today. Pre-Owned. The SD engines came with High Flow Round Port cylinder heads, reinforced lifter galley, 4-bolt main bearing, forged connecting rods, forged-aluminum pistons and additional material in various locations for improved strength. Image: Mecum. fr. Image: Barrett-Jackson. Cylinder Heads . Proactive measures have been taken to address the challenges that COVID-19 brings and we are doing our best to avoid any production disruptions. It's steel design gives it great durability and fit as well as a stock look. When Pontiac developed its tunnel-port Ram Air V, additional ribbing was added to connect the lifter bore banks in the block’s lifter galley, improving rigidity and durability. Browse our large variety of Pontiac Sd 455 for sale this week. Despite the decline of the muscle car, these motors helped Pontiac carry the performance market torch further than any other Big Three automaker. Despite helping the model recover from a dismal 1286 total sales for all Firebirds in 1972 – which rose to 4,802 in 1973 and soared to 10,255 for 1974 – it wasn’t until the following year when the Super Duty option was dropped that Firebird sales really hit their stride, leaping beyond 27,000 examples sold in 1975. The Difference Between a 455 HO and the 455 SD . The second-generation Pontiac Firebird would debut well into the 1970 model season and would enjoy a 12-year run through 1981. Considering its status as legitimate contender during a particularly dismal time for high performance and the relatively low amount of Firebirds that were built with the SD-455, it comes as little surprise that many standard Firebirds of the era were subsequently retrofitted to resemble the more desirable SD-455 cars. Pair Olds 1972-76 455 V8 Heads $350. Limited Supply get yours while you can!! Pontiac 400 428 455 Engine Codes. $450.00. Image: Mecum. We’ve even seen some with the improper text on the shaker stating it was a 455 SD, clearly a seller that is not as much of an enthusiast that he expects his potential buyer to be. This Pontiac started as a standard 350 car into this Tribute SD Trans Am 455, 4-Speed, 4X heads, Rochester Carb, A/C, Heater, All Gauges work... $11,100. DCs D208 & C108 (S). In 1970 Pontiac increased the displacement in an attempt to make up for reduced compression required by new government regulations. $1,069.50 . Provides plenty of vac. About Contact Parts For Sale. The May 7, 1973 changeover date is Motor Unit Number 709986 assembled on or about May 7, 1973 May 7, 1973 is the head assembly date, NOT the casting date. Mecum Mecum. 1970-73 Pontiac Firebird Trans Am Sd-455 Ra 400 Fender To Core Support Tie Bars. 190-3609: Pontiac 400-455 w/ Edelbrock D-Port Head Stud Kit. That same year 252 Trans Ams would be outfitted with SD-455 package, and 72 of those also got the manual gearbox. Find Pontiac 455 in Canada | Visit Kijiji Classifieds to buy, sell, or trade almost anything! Pontiac 455 HO Heads 7F6 ROUND PORTS $2,500 (chi > cedar lake indiana) hide this posting restore restore this posting. 16 heads ('73 and '74 Firebird Formula and Trans Am SD-455s) The 400-455 is pump gas friendly for the mild daily driver. Preparation: SD Performance 250-cfm CNC-Ported Head package. Well it's been a while since we had an update on what's been going on at SD so here's a quick overview. Ultimate. All rights reserved. On Site 5 Axis CNC Head and intake Porting Service Head: Part II . 1976 Pontiac Firebird Trans Am 455 4 Speed $4,700 (dublin / pleasanton / livermore) pic hide this posting restore restore this posting. This cam is by far our most popular street/strip cam for 455-474ci engines. Pushrod Location Street/Strip Race Heads. We were armed with a 400-cfm laminar flow element (powered by six 1.5 hp vacuum cleaner motors), two graduated vertical manometers to measure atmospheric pressure, an incline manometer to measure actual airflow, and a velocity probe. We value your business and appreciate your understanding during this global health emergency. This Pontiac started as a standard 350 car into this Tribute SD Trans Am 455, 4-Speed, 4X heads, Rochester Carb, A/C, Heater, All Gauges work... $11,100 Year 1973 ... For round exhaust port heads only. The 455 powered the Pontiac GTO and Firebird. For 1974, the second and final year of production for the SD-455, a total of 58 Firebird Formula SD-455s and 943 Trans Am SD-455 cars were built, with 212 of the latter receiving the Muncie 4-speed gearbox. Do you have Tech Questions or need help figuring out what you need to accomplish your goals? $2021.00. Sporting a reinforced block with 4-bolt main bearings, forged pistons and connecting rods, a nitride-hardened crankshaft and new oval-port cylinder heads, it’s said that aggressively tuned development motors were making nearly 600 horsepower and 600 pound-feet of torque at GM’s testing labs. 1974 Pontiac Trans AM 455-SD 21090, Linthicum, Anne Arundel County, MD . Pontiac engineers were able to reorganize and focus on the 455 H.O. The SD heads had big, round exhaust ports and even larger intakes. Heads with casting dates starting around mid-March 1973 to mid-April 1973usually will have screw-in studs. The SD blocks utilized 4 bolt mains, forged connecting rods and pistons, and the blocks were cast with a provision for dry sump oiling. Despite the decline of the muscle car, these motors helped Pontiac carry the performance market torch further than any other Big Three automaker. But Pontiac Special Projects engineer Herb Adams and his team decided to develop a unique high performance version of the Pontiac big-block and install it in the company’s pony car, a move that would help achieve near-mythical status for the rare high output variant. It also works well in moderate 389-428ci combo's. Pontiac made closed chambered heads until 1967. Though the R/A V never reached regular production, the feature was incorporated into the 1973–1974 SD-455. 190-4005: Ram Air 5 hex Head Stud Kit . This motor came out of Lucore’s own 1970 Pontiac LeMans and actually performed pretty respectably when tested. Image: Hemmings. Image: Hemmings. Oer Sd-455 . The 455 HO is a bored out version of the Pontiac 400 HO. Casting Date Month A=January, … Compounding the problem for would-be collectors is the fact that externally the SD-455 is almost identical to the more pedestrian Pontiac 455 V8 with an iron block and turquoise painted valve covers. But the SD-455 is a whole new breed of car, not just an engine. $40. or Best Offer +$49.95 shipping. Another iconic Firebird feature also debuted for the 1973 model year – the “screaming chicken” hood decal. The. The SD-455 does get a unique intake manifold however, which is denoted by an LS2 (1973) or an LS2X (1974) cast on it. We start with a raw as cast KRE D-port head and CNC port it to flow. Report. Of course to meet emissions standards and noise regulations the production versions of the SD-455 were far milder. 7F6 heads ('71 455 HO Firebird Formulas, Trans Ams and GTOs) - No. The 455 SD used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. and the now-infamous 455 SD program utilizing the designs developed in Ram Air D-port and Round Port heads. The Trans Am would dominate as the Firebird’s top performance model and later would become a movie star of sorts through the Smokey & The Bandit franchise. Featuring a Pontiac 400 cubic inch block stroked to 455 cubic inches, this authentic Pontiac stroker is perfect for street and strip use. Since all Pontiac engines must be considered a "big" block, the 455 is not new or unusual in the Firebird chassis. Adams’ team cleverly disguised the new motor as a warmed-over version of the high-volume production 455 in Pontiac’s parts bin, but in reality, the SD-455 more closely resembled a detuned race motor and shared very little in common with the more pedestrian Pontiac 455. Lover of noisy cars, noisy music, and noisy bulldogs, Brad can often be found flogging something expensive along the twisting tarmac of the Angeles Forest. The SD-455 could be had with a Muncie 4-speed manual gearbox, but the majority of buyers opted for the three speed automatic gearbox instead. Watch; 455 Pontiac GTO TRANS AM Engine BlocK YC Code 485428. GM FoMoCo MOPAR Gaskets Ignition & Small Electrical Items ... Pontiac 400 428 455 Engine Codes; Pontiac 400 428 455 Engine Casting Numbers; Pontiac Cylinder Head ID Numbers; Printable PDF. Since all Pontiac engines must be considered a "big" block, the 455 is not new or unusual in the Firebird chassis. Heads can be used on your 1965 – 1979 Pontiac motor with displacements from 350 – 455 cid; CNC’d combustion chambers available on 74 cc and 85 cc chambered heads; CNC ported options of 290, 310, 325 and 340 cfm . Patterned after Q-jet guru Cliff Ruggles personal modified OEM iron intake, a back to back dyno test showed a 12 hp gain over a stock plenum OEM intake. That may seem like an odd market reaction to a reduction in performance options, but it is due in no small part to the fact that with the introduction of the Pinto-based Ford Mustang II the previous year and the discontinuation of both the Dodge Challenger and Plymouth Barracuda after 1974, the GM F-bodies had essentially no competition in the pony car market at that point. WIP: 1955 Pontiac Star Chief Still, it … The lifter galley was reinforced with additional bracing to prevent cracking as well. Although the engine yielded a far less impressive SAE net rating of 290 horsepower and 395 pound feet of torque by the time it made it to production, it was still highest output motor available from a Detroit automaker in 1973 and 1974. Pontiac 455 Big Block Engine. It's best to use a aftermarket aluminum head or reduce your compression by using a factory 400" Pontiac Iron head like a 1971 # 96, or 1972 7K3, both at 96 cc's. 190-4203: Pontiac 400, w/Edelbrock aluminum heads Head Stud Kit. But a few projects managed to slip passed the bean counters and bureaucrats to some degree, and the Pontiac Super Duty 455 V8, available only for the 1973 and 1974 model years, is widely considered the last gasp of serious performance from the muscle car era.
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