Results 1 to 9 of 9

Thread: Pontiac 455

  1. #1
    Vulture of The Western World Eric's Avatar
    Join Date
    Jul 2006
    Location
    The Land of The Edentulites
    Posts
    22,751

    Pontiac 455

    Here's a shot of the engine compartment of my '76 Trans-Am; the engine's a 455 V-8 with stock 6X heads (some port work done), 280 degree cam with Rhoads lifters and 1.65 ratio rocker arms, Edelbrock Performer intake and re-jetted Quadrajet carb. The shaker has been opened up to take in air from outside and the exhaust is comprised of reproduction Ram Air III castr iron "headers" with 2.5 inch pipes. Stock HEI ignitionhas been replaced with an MSD unit.

  2. #2
    SCRAMbler
    Guest

    Re: Pontiac 455

    Need more pics of your T/A. Are they anywhere on this site (including info about your mods)?
    SCRambler

  3. #3
    Vulture of The Western World Eric's Avatar
    Join Date
    Jul 2006
    Location
    The Land of The Edentulites
    Posts
    22,751

    Re: Pontiac 455

    Quote Originally Posted by SCRAMbler
    Need more pics of your T/A. Are they anywhere on this site (including info about your mods)?
    SCRambler
    I've been meaning to post a few; bad weather outside has kept the car inside! But I promise to get to it in the next day or so - hopefully, tomorrow. We have a local "cruise night" and weather-permitting I plan to be there...

  4. #4
    Staff
    Join Date
    Aug 2006
    Location
    Houston, TX
    Posts
    3,126

    Re: Pontiac 455

    Quote Originally Posted by Eric
    Here's a shot of the engine compartment of my '76 Trans-Am; the engine's a 455 V-8 with stock 6X heads (some port work done), 280 degree cam with Rhoads lifters and 1.65 ratio rocker arms, Edelbrock Performer intake and re-jetted Quadrajet carb. The shaker has been opened up to take in air from outside and the exhaust is comprised of reproduction Ram Air III castr iron "headers" with 2.5 inch pipes. Stock HEI ignitionhas been replaced with an MSD unit.
    I like it. What kind of performance benefits do you get from the MSD unit? What type of transmission do you have in it?

    I have always liked that engine as well.

    If I ran into one, I'd like to have a Firebird styled like the gold 1974 Espirit with the 400 engine that James Garner drove on the Rockford Files. It was a beautiful car as well.

  5. #5
    Vulture of The Western World Eric's Avatar
    Join Date
    Jul 2006
    Location
    The Land of The Edentulites
    Posts
    22,751

    Re: Pontiac 455

    The MSD offers a couple of benefits - hotter spark, for one. Also, it has a built-in (and adjustable) rev limiter, so no worries about grenading the engine (a real concern with long stroke engines like the 455, which doesn't appreciate more than about 5,700 RPM with stock rods).

    The transmission currently in the car s a modified THM2004-R (4-speed overdrive with lock-up converter). It provides great off-the-line/quarter-mile acceleration (it'll bark the tires on both th 1-2 and 2-3 upshifts) as well as easy highway cruising, thanks to the steep overdrive ratio in fourth - even with 3.90 gears out back.

    Gold is a great color for the second generation Firebirds; I had a friend who owned a one of three built 1970 RA III 400 Formula with 3-speed transmission in that color - beautiful car.

    Mine's Carousel Red - a bright red orange color that also really works on this car. It's a rare color, too - only available in '76 and 1980. I've never actually come across another one in the flesh - though I've seen them in magazines, etc. Another very rare color is Goldenrod Yellow - another '76 hue that I believe was only offered that one year.



  6. #6
    Staff
    Join Date
    Aug 2006
    Location
    Houston, TX
    Posts
    3,126

    Re: Pontiac 455

    Eric -

    I forgot to ask if you have the original 100 mph speedometer unit or did you replace it with the 160 mph version that was available in 1974 only?

    Just thought I'd ask.



  7. #7
    Senior Member
    Join Date
    Jul 2006
    Location
    Raleigh NC, USA
    Posts
    3,628

    Re: Pontiac 455

    it'll bark the tires on both th 1-2 and 2-3 upshifts
    Aren't you worried about losing traction when it does that?

    A friend has a Mach One Mustang, and went with an Art Carr C6 (vs. a rebuilt stock tranny) because it wouldn't bark the tires. Yes, there's some slippage inside, but it's much less than what you'd get from the tires. Smoother is better (I think!)

    Chip H.

    Former owner: 2012 Honda Civic LX, 2006 Honda Ridgeline RTL, 2000 Honda CR-V EX, 2003 MINI Cooper S, 1992 Honda Accord LX, 1999 Mercedes ML-320, 1995 VW Jetta GLX, 1991 Mercury Capri XR2, 1981 Mercury Zephyr, 1975 Chevrolet Impala

  8. #8
    Vulture of The Western World Eric's Avatar
    Join Date
    Jul 2006
    Location
    The Land of The Edentulites
    Posts
    22,751

    Re: Pontiac 455

    Quote Originally Posted by swamprat
    Eric -

    I forgot to ask if you have the original 100 mph speedometer unit or did you replace it with the 160 mph version that was available in 1974 only?

    Just thought I'd ask.


    Yep - I have a 160 speedo i n the car (and the original speedo in a box). Nothing I'v done to the car couldn't be undone with wrenches and a couple hours' time!


  9. #9
    Vulture of The Western World Eric's Avatar
    Join Date
    Jul 2006
    Location
    The Land of The Edentulites
    Posts
    22,751

    Re: Pontiac 455

    Quote Originally Posted by chiph
    it'll bark the tires on both th 1-2 and 2-3 upshifts
    Aren't you worried about losing traction when it does that?

    A friend has a Mach One Mustang, and went with an Art Carr C6 (vs. a rebuilt stock tranny) because it wouldn't bark the tires. Yes, there's some slippage inside, but it's much less than what you'd get from the tires. Smoother is better (I think!)

    Chip H.
    That's a big part of the fun! It will get sideways in a very big way if you really hit it; but I know the car and can modulate it (and know what to expect when it does break lose).

    I like the animal wildness of a real-deal muscle car. It's not just the power - it's the uncontrolled/potentially dangerous power that defines a muscle car. The new ones are too sanitized and civilized - as quick as they are.

Similar Threads

  1. Does this Pontiac Can Am have a 403 Olds or a 400 Pontiac?
    By dieseleverything in forum Classic Car Corner
    Replies: 1
    Last Post: 05-20-2010, 08:15 AM
  2. Is the end near for Pontiac?
    By chiph in forum Motor Mouth
    Replies: 26
    Last Post: 05-01-2009, 07:04 AM
  3. Pontiac - RIP
    By Disco Man in forum Automotive News
    Replies: 16
    Last Post: 04-29-2009, 07:43 AM
  4. US Take On Pontiac From Oz
    By robmcg in forum Motor Mouth
    Replies: 7
    Last Post: 03-20-2007, 10:30 PM
  5. Pontiac G8
    By swamprat in forum New Car/Truck Reviews
    Replies: 5
    Last Post: 02-09-2007, 10:14 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •