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TBI Heads cc?

Discussion in 'The Garage' started by jimmy'sjimmy, Jun 29, 2006.

  1. jimmy'sjimmy

    jimmy'sjimmy 1/2 ton status

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    Wondering what size the stock TBI heads are? I thought they were 64cc but I was talking to a guy at a machine shop and he said they are most likely 76cc. Anyone no for sure?
     
  2. btolenti

    btolenti 1/2 ton status

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  3. jimmy'sjimmy

    jimmy'sjimmy 1/2 ton status

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    Is there anyway to tell for sure? I found some other sites that say these are 76cc no matter what. just want to be sure before i buy this short block or my compression will be way too hi.
     
    Last edited: Jun 29, 2006
  4. btolenti

    btolenti 1/2 ton status

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    the only sure fire way to know is to check the head casting number in a part's book. Do you have the casting number?
     
  5. sled_dog

    sled_dog 1 ton status

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    350s had 76ccs
     
  6. b454rat

    b454rat 1/2 ton status Premium Member

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    The heads I had were 64s, so maybe 305 heads, but all I know is they made my TBI406 a MONSTER!!!!
     
  7. TallCowGirl

    TallCowGirl Registered Member

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    1987-88 EFI Swirl Port Head

    Hi There...I had a 383 engine made from an 1987 TBI 350. The head casting number was 14102191. The engine builder thought the head chamber volume was 76cc's, but (after lots of research and asking people) it turns out that 14102191 or 14102193 heads have a 64cc chamber volume.

    Hope this helps,
    Diana
     
  8. NateInChandler

    NateInChandler 1/2 ton status

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    Actually im not so sure that 350's all had 76cc heads, some of the 90-93 TBI motors were rated at 9.5:1 compression and that isnt gonna happen with 76cc heads and a flat top piston. I know my motor puts out almost 180psi in each cyl and its a bone stock 91 TBI Motor.
     
  9. jimmy'sjimmy

    jimmy'sjimmy 1/2 ton status

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    casting # ends with 191
     
  10. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    TBI heads are 76cc chambers, it's the vortec's that have 64cc chambers.
     
  11. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    so do you want bigger or smaller???what is the main difference??? :crazy:
     
  12. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I'm assuming you're refering to chamber size. That all depends on what compression ratio you're looking to achieve. If you have 76cc heads and want more compression then going to a smaller chamber will achieve this but may not always be a good thing. Compression, cam, and induction all work together to form a package that will make torque and HP but changing one thing and not the other could be counter productive.
     

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