This is going to max out the dumb-o meter but??
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 15

Thread:
This is going to max out the dumb-o meter but??

  1. #1
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default This is going to max out the dumb-o meter but??

    Is there such a thing as a closed chamber after market bbc cylinder head.
    Another Hot Boat refugee

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,271

    Default

    Edelbrock has a 110cc "sort of" closed chamber, and the GMPP ROval (which is basically the same head)
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  4. #3
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default

    What would 8 or 9 cc's do to a compression ratio???? I'm guessin not that much .5??
    Another Hot Boat refugee

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Bostick Racing Engines six-oh-nine's Avatar
    Join Date
    Jan 2008
    Location
    El Cajon, Ca.
    Posts
    1,063

    Default

    Quote Originally Posted by H20MOFO View Post
    What would 8 or 9 cc's do to a compression ratio???? I'm guessin not that much .5??
    Typically... on a 454/468 type app.. going from open chambers to closed chambers... about 12cc will get you about a point of compression.
    Last edited by six-oh-nine; 08-27-2009 at 11:32 PM.
    The Bostick®

    Some people play hard to get... I play hard to want.

  7. #5
    Senior Member ap67et10's Avatar
    Join Date
    Mar 2008
    Location
    Chico, Ca
    Posts
    1,533

    Default

    Quote Originally Posted by H20MOFO View Post
    What would 8 or 9 cc's do to a compression ratio???? I'm guessin not that much .5??

    i did some quick numbers on my 502 i'm building which will have about 8.75:1 but if i drop 8cc on the heads and everything else is the same it jumps the compression up to about 9.35:1. the ratio of how much a cc will change the compression will differ with different cubic inches also (if i'm not mistaken)

    AP

  8. #6
    Some guy obnoxious001's Avatar
    Join Date
    Dec 2007
    Posts
    3,570

    Default

    Quote Originally Posted by H20MOFO View Post
    Is there such a thing as a closed chamber after market bbc cylinder head.
    Quote Originally Posted by steelcomp View Post
    Edelbrock has a 110cc "sort of" closed chamber, and the GMPP ROval (which is basically the same head)
    They also have one that is 100 cc:

    PERFORMER HIGH-COMPRESSION 454-O

    100cc semi-open chamber heads feature a 1-1/2° rolled over (angle milled) design that improves intake port alignment and provides a smaller combustion chamber without shrouding the valves
    9.2:1 compression with flat-top pistons for an outstanding high performance street head
    8.8:1 compression ratio when used on 1987-up TBI-equipped 7.4L dished piston motors
    Produced over 450 ft/lbs. torque when combined with our Multi-Point EFI System


    PERFORMER HIGH-COMPRESSION 454-O
    Chamber Size Intake Port Size Valve Sizes (in/ex) Bare (single) Complete (single)
    100cc 290cc 2.19"/1.88" #60489 #60499
    Note: See the Cylinder Heads Chart for specs. Mark IV rocker arms and valvetrain parts required.

  9. #7
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Quote Originally Posted by H20MOFO View Post
    Is there such a thing as a closed chamber after market bbc cylinder head.
    OHH its Maxed!!

    On my 434 with the 124 cc heads its 8.2
    With the 100 cc heads its 10.0 ish...you can also pick up a little with the head gaskets.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  10. #8
    Senior Member hotbo's Avatar
    Join Date
    Feb 2008
    Location
    lake Ouachita AR
    Posts
    4,677

    Default

    brodix offers closed chambered heads,angle milled.look on there website some of the best heads in the world.

    the general rule of thumb is for every 10cc that is close to 1 point in compression.

  11. #9
    21 Daytona Outlaw's Avatar
    Join Date
    Dec 2007
    Location
    Artesia, N.M.
    Posts
    5,291

    Default

    Yeah it's called a BLOWER
    #55

  12. #10
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,271

    Default

    My bad...I meant 100cc...thanks for the clarification.
    Quote Originally Posted by obnoxious001 View Post
    They also have one that is 100 cc:

    PERFORMER HIGH-COMPRESSION 454-O

    100cc semi-open chamber heads feature a 1-1/2° rolled over (angle milled) design that improves intake port alignment and provides a smaller combustion chamber without shrouding the valves
    9.2:1 compression with flat-top pistons for an outstanding high performance street head
    8.8:1 compression ratio when used on 1987-up TBI-equipped 7.4L dished piston motors
    Produced over 450 ft/lbs. torque when combined with our Multi-Point EFI System


    PERFORMER HIGH-COMPRESSION 454-O
    Chamber Size Intake Port Size Valve Sizes (in/ex) Bare (single) Complete (single)
    100cc 290cc 2.19"/1.88" #60489 #60499
    Note: See the Cylinder Heads Chart for specs. Mark IV rocker arms and valvetrain parts required.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default

    Quote Originally Posted by obnoxious001 View Post
    They also have one that is 100 cc:

    PERFORMER HIGH-COMPRESSION 454-O

    100cc semi-open chamber heads feature a 1-1/2° rolled over (angle milled) design that improves intake port alignment and provides a smaller combustion chamber without shrouding the valves
    9.2:1 compression with flat-top pistons for an outstanding high performance street head
    8.8:1 compression ratio when used on 1987-up TBI-equipped 7.4L dished piston motors
    Produced over 450 ft/lbs. torque when combined with our Multi-Point EFI System


    PERFORMER HIGH-COMPRESSION 454-O
    Chamber Size Intake Port Size Valve Sizes (in/ex) Bare (single) Complete (single)
    100cc 290cc 2.19"/1.88" #60489 #60499
    Note: See the Cylinder Heads Chart for specs. Mark IV rocker arms and valvetrain parts required.
    Too bad those runners are too small for me...
    Another Hot Boat refugee

  14. #12
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by H20MOFO View Post
    Too bad those runners are too small for me...
    The problem with the late replacement (vortec?)100cc Eddy head is it is a little shrouded in the chamber. Not as much as a GM closed chamber, but it does impeed(sp) flow. I had a talk with Steel about this head awhile back, and is to bad that some one hasn't built a head with a oval, roval port where the roof is where the rect head roof is. the Eddy vortec head has quite a bit of roof above the port, and it can be raised quite a bit before breaking into the rocker area. Not quite as big a rect, but a lot better than as cast. The other problem with them is that there no pistons other than flat tops that will work with them. Even regular roval 110cc and rect 118cc Eddys and GM signature heads require a dedicated head if it has a dome. SRP small domes work, and JE has a couple of Eddy hi compression pistons, but niether will work with the vortec Eddy. So now you need a custom slug. I have kick this head around alot, and someday I may give it a go. I am amazed someone like Dr. J hasn't maxed out a set of those.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
    Last edited by gn7; 08-28-2009 at 08:47 AM.

  15. #13
    Senior Member CK7684's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Posts
    550

    Default

    I've got domed pistons with my Edelbrock RPM oval port heads...

  16. #14
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Go back and read my post. Yes, there are Eddy compatable domed pistons out there. SRPs small dome is one. But the don't work with the 100cc vortec Eddy head.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95