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: 454 Compression ratio -- small cc head or domed piston
          
   
   

Reply To Thread
Results 1 to 7 of 7
  1. #1
    jkferrell is offline CHR Member Visit my Photo Gallery
    Join Date
    Jun 2006
    Location
    wheaton
    Posts
    7

    454 Compression ratio -- small cc head or domed piston

     



    I want to switch to aluminum heads and raise my CR to 9.2 - 9.5. I am running road race tracks and am using an oval port Air Gap with a Comp cam 280 and a 750 Holley. RPM range is 3000 - 5500.

    My main goal is to get rid of the weight of the CI heads. While I am at it I thought going up in CR would be worthwhile.

    Edelbrock says that I can use a 60459 (110cc) head and get 9.5 with domed top pistons or 60499 (100cc) with flat top pistons and get 9.2. Obviously a lower cost route.

    Any thoughts?

    Jim

  2. #2
    Grumpy 427's Avatar
    Grumpy 427 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2006
    Location
    Regina canada
    Car Year, Make, Model: 1977 camaro
    Posts
    65

    You will also notice a significant gain in your low and midrange power curve too.Compression is relative to making HP. Your cam and cylinder heads need to be matched, I have learned that with a better flowing set of heads, you don't require as big of cam anymore.The heads move air more efficiently without having the valve held open as long by a bigger lift cam.
    9.65 @ 137 MPH 1.39 60' More left in the car.

  3. #3
    acechev55 is offline Registered User Visit my Photo Gallery
    Join Date
    Nov 2005
    Location
    west chicago
    Car Year, Make, Model: 55 chevy h.t.
    Posts
    2

    Well my thoughts are the more fuel/air you can get in you cyclinders
    the more H.P. your make. I would go with 110 cc head with the dome pistion if I could afford it.

  4. #4
    Grumpy 427's Avatar
    Grumpy 427 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2006
    Location
    Regina canada
    Car Year, Make, Model: 1977 camaro
    Posts
    65

    Oh sorry. yes i agree the open chamber head will flow way better than a closed chamber head.
    9.65 @ 137 MPH 1.39 60' More left in the car.

  5. #5
    jkferrell is offline CHR Member Visit my Photo Gallery
    Join Date
    Jun 2006
    Location
    wheaton
    Posts
    7

    Edelbrock claims the flow on these two heads is exactly the same. They call the chamber a semi-open design.

    Thoughts?

    Jim

  6. #6
    gassersrule_196's Avatar
    gassersrule_196 is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2004
    Location
    Lawrence
    Posts
    3,261

    use a small chamber and a dome piston for ultimate compression and power

  7. #7
    Grumpy 427's Avatar
    Grumpy 427 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2006
    Location
    Regina canada
    Car Year, Make, Model: 1977 camaro
    Posts
    65

    I had the edelbrock rpm performer marine heads with 11.25-1 compression. it ran on pump gas and made 550Hp and 513 TQ this was a 427 BBc with a hydraulic roller cam
    9.65 @ 137 MPH 1.39 60' More left in the car.

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