So, the 73 also has 290HP stock. engine and without the available Hurst t-tops. Classics on Autotrader has listings for new and used 1970 Pontiac Trans Am Classics for sale near you. Pontiac shut it down however it has been said that around 200 Ram Air V engines were sold from the dealers as crate engines. It was amazing when out of nowhere this super duty engine came in 1973. I believe it can make GTO reach 190-195 mph if fitted with long ratio 4 speed if the aero allow it. The cams were the same as was everything else in the engines. There was no difference in net horsepower. The car also boasted The 1974 model year would see a minor refresh of the Firebird with the transition to the 'shovel-nose' front end as well as the wider slotted tail light design. For the 73/74 SD's, according to the SD registry, there are about 250 74 SD's listed in various conditions and a similar number of 73's. Car and Driver tested one and got a quarter mile of 13.75 at 103.56 mph. Due to the car’s brief stint in production and legendary performance for the era, original examples can fetch over $100,000, with the especially rare manual gearbox equipped examples sitting at the top of the value totem pole.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. Pontiac had no real competition for the Trans-Am in the bleak years to follow. The concept of "Win on Sunday and Sell on Monday" was all but dead. The only other modification has been the addition of a 2400 RPM stall speed. Not 250 as I had said earlier. V8TV 72,034 views. 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 Just removing the metal block-off plate from the shaker scoop (which in turn made it totally functional) yielded substantial performance gains. 1973 Pontiac Trans Am 455 Holley Sniper EFI Gear Vendors Overdrive Install V8 Speed and Resto Shop - Duration: 12:42. Lot #32,088. @ Super8 : you better type the 1973 Pontiac Firebird Trans Am sd455 3.08 Automatic . Pontiac just left the print as it was at the original 310 number. Perhaps it was because Trans Am was now the only game in town. The engine has been re-done to specifications primarily the way Pontiac engineers envisioned it before the EPA clamped down on them and they had to tone it down.

Image: HemmingsConsidering 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.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. @ Bijan: Maybe you can add the real one cuz I'm losing my cool right now. Only 2 things stopped me. 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. To chime in about the Ram Air V, to the best of my knowledge, Pontiac never sold any of these to the public. You were able to quite well getting your legs under you in that 1970 Ram Air III car. @Bijan I completely agree. Here is a Goldenrod Yellow 1976 Pontiac Trans Am with a 455 cubic inch V8 engine and 4 speed Borg Warner transmission. Pontiac's RULE.74SD455TA  I am the proud owner of a 74 SD 455TA. 1971 Pontiac Trans AM 1971 Pontiac Trans Am 455 HO Additional Details: - 455CID V8, 3-Spd. Naturally the EGR valve was rendered inoperative. Life is too short not to have an SD.