1974 Trans Am SD-455 full throttle take off

1974 Trans Am with SD-455 engine rolling into the throttle. Super Duty engine is completely original. Exhaust features new stock-replacement crossflow muffler from Waldron Exhaust.

Category:

Autos & Vehicles

Tags:

• 1974
• 74
• Pontiac
• Firebird
• Trans
• Am
• SD455
• SD
• 455
• Super
• Duty
• Waldron
• crossflow

[MrTransAm1979]

@jpmeyer95 as fast as you want it to go as long as its a straight line lol

[crispiegee1]

Much as I like the SD Trans Am, I honestly doubt it can do 160 plus. It simply didn't have the aerodynamics (nor the horsepower) to do so. Even the far more aerodynamic late nineties Trans Am with the 305 hp LS1 could just hit 160.

Much more important than top speed, though, is that this car is original and pristine. Yeah, the owner could put in a different intake & cam, etc., but to have a perfectly original specimen is worth so much more than a few miles per hour. Beautiful car!

[APontiacof455cubes]

@crispiegee1 The SD455 was rated at "290" hp. However, since the engine was going to originally be used for racing, a simple cam swap, bigger carb and headers would yield nearly 500hp. Little more than a few mph!

[DEATH94SQUAD]

@crispiegee1 It can go 160 easy, if a 396 camaro can it can to

[murdertrain03]

My dad has owned his 74 sd 455 since 1975 and has raced just about every car except a stage 1 Buick , nobody in the area had one. He said the only car to give him a run was a ls6 chevelle owned by his buddy, but he never lost to it. The sd had long tubes and a cam. Ran high 12s at the track. We got it out of storage after over 15 years of sitting and it ran a 14.0, stock exhaust and cam, 245 dry rotted tires and all.

[camirocz]

@judgegixxer Baloney one was rated at 310 h.p net and the other at 290.They are the same exact car except a slightly more agressive cam in the 73 .Not more than a tenth seperates them in a quarter mile drag race.High thirteens at best in totally stock trim.THOSE ARE THE FACTS!

[judgegixxer]

@camirocz 73' SD could hang with an ls6 but not a 74'. The SD 455 had the most power in its 73' edition. It was the last GM car to hold on to its power. For 74' it was a ghost of its former self. 73's were almost right on 13seconds.

[vicmason25]

enough room an he could see 160. i have a 89 F'bird GTA completely stock (350 T.P.I) that has seen 145 and it was still climbing before i let off

[ztwntyn8]

@crispiegee1 number cruncher...... !!! my 400 RA III goes past 110 alot faster than my LT1 M6 (which was tested at 159mph). I know that with the right gears or an overdrive the car would def do 160 but more like 175 imo

[camirocz]

@1979Formula455 An ls6 chevelle will never lose a race to a s.d trans am .Stop repeating bullshit stories that have been enhanced over time.Here in montreal we have a guy who owns the worlds fastest stock bolt on s.d he se owned it since new and has repeatedly told us that all stock it was a 14.0 second car,no better.Its a 74 automatic.Car now runs 12 flat.

[ztwntyn8]

Nice ride. As far as 160 goes.... sure it will with right gears. My RA III Formula auto runs 13.5 and my LT1 M6 13.8 and I can tell you that the old Pontiac pulls much harder in Drive than the LT1 in 4th (both drive and 4th being 1:1 ratio). So, if like tests say, my LT1 is good for 159, then the old pontiac will do it too with the right gears or another gear (overdrive) and then some. My old bird feels the same at 70 as it does 120. If you about off the road at 140 in the 79... rebuild frontend

[79tazman]

@1979Formula455 160+ there is no way it would go that speed on a road plus you would have it blow up on you from over reving it depending on your rear gear I had my car at 140 and it was all I could do to keep it on the road and the motor was ready to pop and thats with a 308 rear gear