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High Compression N/A with over bore

Discussion in 'SN-95 and New Edge Mustangs' started by RainyP71, Mar 26, 2021.

  1. RainyP71

    RainyP71 Member Established Member

    Messages:
    89
    Joined:
    May 8, 2015
    Location:
    NC
    Hey everyone,

    Not an engine building expert so wanted to ask some advice. Doing a budget build and have some random parts

    I've got a cobra iron block that needs to go to 0.0020/30 over. I was wanting to do a higher compression N/A build, possibly low boost in the future. Using h beam rods, forged crank.

    I was wondering, if I'm doing 10.5:1 of higher, will I be okay at 30 thou over using Cometic C5118-040 head gaskets and arp 8740 head studs? Need to figure out if I need to buy another block or other supporting parts.

    Thanks!

    Sent from my SM-G975U using Tapatalk
     
  2. 01yellercobra

    01yellercobra AKA slo984now Established Member

    Messages:
    17,522
    Joined:
    Oct 5, 2005
    Location:
    Cali
    I think the iron blocks can handle a bit more of an overbore. Is sonic checking still a thing? I remember it being mentioned a lot back when I played with carbs and push rods.

    I ran those kind of head studs on a big bore iron block with boost and didn't have any problems. I used Cometic gaskets as well.

    Personally I think you'll be ok. Just have the block looked over before committing to anything.
     
  3. Blkkbgt

    Blkkbgt Well-Known Member Premium Member Established Member

    Messages:
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    Joined:
    Feb 3, 2011
    Location:
    The land of commies and socialists!
    Why does the block NEED a .020 or .030 over bore?

    Does it have damage cylinders or is this what your machine shop is telling you?
     

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