: Trans Am 455



frip
05-03-04, 08:52 AM
Some color pics of 1970s Trans Ams, 1972 455 HO & 1977 W72 400. I have some specs on the blue 1972 7.5 liter car.

weight: 3700 lbs, 300 bhp @ 4000 rpm, 415 lbs/ft @ 3200 rpm

1/4 mile acceleration 14 seconds dead

http://www.78ta.com/international.htm (http://www.78ta.com/international.htm)

Not bad for a 32 year old 4 speed manual. Faster than my 85 Cimarron 2.8 V6. :)

ttown
05-03-04, 10:25 AM
My uncle owned one for awhile. It had lots of motor mods and about 12.5:1 compression. That car was awesome. When he hit the gas, it would squat and take off like a rocket.

The car came factory with air and power windows. It was white with blue strip and white interior.

Beautiful car!!

frip
05-03-04, 11:03 AM
That's great to hear. Just for the record those Trans Ams from 1971/72 had 8.4 to one comp from the factory because of GM's plan to go low lead/no lead gas, they still cranked out some horsepower though.

I noticed the other day that a Subaru WRX put down a weight of 3,400 lbs when it was dyno tested. That's not much less than a 1970s Vette or Trans Am. Cars aren't light these days. Must be all the safety equipment. :confused:

ttown
05-03-04, 11:16 AM
[QUOTE=frip]That's great to hear. Just for the record those Trans Ams from 1971/72 had 8.4 to one comp from the factory because of GM's plan to go low lead/no lead gas, they still cranked out some horsepower though.

He added angle milled heads (6 2's I believe) and high comp. pistons along with a big cam.
He had to run high octane mixed with av gas. (1/2 and 1/2)

frip
05-03-04, 12:12 PM
I have a friend that bought a 1974 SD 455 Trans Am new. He waited for a long time to take delivery and unfortunately had an early engine problem. He didn't want to have them replace the motor under warranty because he suspected they would just replace the SD 455 with a normal 455, so he took the engine to a machine shop where they fixed the heads and while they were at it raised the compression (which was also a stock 8.4 like the 71/72 HO motor). The car certainly had extra pep after the mod. Hot Rod magazine timed a normal 1973 automatic SD 455 Trans Am at 13.5 seconds for the 1/4, so his 4 speed manual version must have been even quicker. :bouncy:

ttown
05-03-04, 12:18 PM
Sweet!

I wouldn't mind adding one to my garage.:)

frip
05-03-04, 12:23 PM
Looks like you already have some impressive vehicles in your garage. :D

ttown
05-03-04, 12:25 PM
Thank you, I am now considering adding a viper truck to my collection.

Just have to get it passed the Mrs.:worship: (please,please,please,please!!!)

c5 rv
05-03-04, 08:00 PM
My older brother had a '73 TA that he wouldn't let me drive. I don't remember what engine he had, but being a '73, it was pretty choked down by emissions equipment.

I remember one trip from CA to OH. We spent the night at his friend's place in Phoenix and then he drove straight through to Terre Haute, IN - through an ice storm in OK. I think it was about 30 hours - not too bad for a Merchant Mariner who was used to pulling 2 day shifts.

frip
05-04-04, 04:56 AM
455 was the only engine size for the 1973 Trans Am, there was the regular 250 bhp net L75 455 and the Super Duty LS2 455, rated at 310 bhp, but underquoted for insurance. This was about the time the Caddy 500 ci motor came on the scene.

c5 rv
05-04-04, 07:51 PM
Thanks! I thought I remember it being a 455, but I wasn't sure after so many years.

frip
05-05-04, 01:26 AM
You are quite safe, for the 1971-73 MYs Trans Ams were only available with a 455. In 1970 1/2 MY they only had 400s, but they were high compression 10.5 to one 400s. The 400 engine didn't return to the Trans Am until the 1974 MY, but the 1974 cars had the full front and rear 5 mph bumpers so they are easy to tell apart from the pre 1974 cars. :)

SoundAdvantage
05-05-04, 03:41 AM
Nice Ponchos > I own a 77' Trans Am with the 6.6 Litre 400 :) shes an Automatic but I like Autos>Clutches are a pain to replace on manual tranny's Anyway's my 77 looks just like yours Black on Black. Only difference is mine doesn't have T-Tops. I am thinking of selling it and buying me an STS. The T/A is not a practical every day driver. She sits parked in my garage 90% of the time, I love the car though>she runs like a Bat out of Hell.

frip
05-05-04, 04:23 AM
T-tops look nice, but have the potential to leak.:crying2: It's expensive to renew the seals and the body structure isn't as rigid as a fully roofed car. I have heard of stress cracks developing on T-top cars where folks have done swaps to more powerful engines.