Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: 400 vs 455
          
   
   

Reply To Thread
Results 1 to 4 of 4
  1. #1
    Tommy's Avatar
    Tommy is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Location
    Kentucky
    Car Year, Make, Model: 79 TransAm
    Posts
    4

    400 vs 455

     



    i have a 400 30 over trw flat tops xe 284 comp cam 72 cc heads with 995 valve springs 10 degree retainers heads ported all the way through performer rpm intake 750 mighty demon carb msd ign.heddman 1 3/4 headers through 3 in.ex i'm going to put heads cam intake carb ign.headers on 455 30 over with trw flat tops(not concern with compression)i was wondering what kind of gain i would see and any suggestion thanks

  2. #2
    Tommy's Avatar
    Tommy is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Location
    Kentucky
    Car Year, Make, Model: 79 TransAm
    Posts
    4

    thanks for the help

  3. #3
    m14dan is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    lubbock
    Car Year, Make, Model: 73 electra, 84 c-20, 91f-150 4x4
    Posts
    22

    wich 455 are you using? buick or olds? big difference! My wifes hot rod is a buick electra 225. She is a college professor so has to look civilized. It has a stage 1 455 with a smallish crane cam and edelbrock intake and a 750 holley avenger. At it's last inspection before we moved here it was getting 420 hp at rear end. It is a big heavy car but man will it move. The ac still works perfect and so does the cruise. I just had to swap the air ride out in favor of good gas shocks because of the cam. It was a vaccume operated air pump. Oh well. The exh is basicly stock too so it is a real sleeper. If you are looking for a real hot rod 455 though I hope you got one from a olds as they have a lot more performance parts available than buick does.

  4. #4
    The Al Show's Avatar
    The Al Show is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2002
    Location
    .
    Car Year, Make, Model: .
    Posts
    631

    If I understand what you're saying, you want to put heads from a 400 sbc onto a GM 455 big block engine and you want to know if you will gain anything from it. I think all you'll gain is a lesson on incompatibility. If you're chaging heads the compression is very important and should be of some concern. It doesn't make sense to put heads from a smaller engine on a big engine. It usually wont flow as much air/fuel mix as the heads designed for it. That's probably why no one here had any experience with it.
    AL
    " Im gone'

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink