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Good heads with a real small chamber?

Discussion in 'The Garage' started by sled_dog, Feb 7, 2004.

  1. sled_dog

    sled_dog 1 ton status

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    Would like to bump my compression up pretty good. I figure with the Speed Pro pistons I have in my 355 I've got like 8.9:1 compression with my present 76cc chamber heads. I want more like 10 or 11:1 but only way thats gonna happen is with 58cc heads. Is there such a thing as a good flowing 58cc head?
     
  2. alesko

    alesko Registered Member

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    Yes chevy used 58cc heads on 305 high output engines back in the 80's.
    You might have to run aviation gas with that compression though.
     
  3. sled_dog

    sled_dog 1 ton status

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    ha, no it would be race fuel for me, my dad is a dirt track racer having a big time compression motor built right now, should produce about 450 horsepower at about 7000rpms and will require some big octane. 305 heads sucks, thats why I said good flowing 58cc heads.
     
  4. bigyellowjimmy

    bigyellowjimmy 1/2 ton status

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    Ive got a 327 engine with 3890462 heads Im trying to sell, if ya just want the heads you can have them.....62cc 1.94/1.5 valves 1966 manufactor date. Can cut for 2.02 valves if desired. They are dissasembled and have been magnafluxed to verify no cracks....these are some of the best production heads ever made by GM, they do not have accessory holes though. $225 plus shipping if your interested /forums/images/graemlins/thumb.gif
     
  5. alesko

    alesko Registered Member

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    With your dad being a dirt track racer with big compression, you should already know the answer about the heads. ha
     
  6. tarussell

    tarussell 1/2 ton status

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    GM made a fairly good set of aluminum heads with casting # 10088113 .
    Port volume is 163 Int and 58 Exh
    Valve size is still 1.94/1.50
    Chamber volume is 58 cc's
    The GM part number is 10185086

    Another head is a Bowtie Phase 6 casting # 14011049
    Port volume Int 175 / Exh 59
    Valve size 2.05/1.60
    55 cc's
    GM part number 10051167

    I personally like the casting number 10088113 on a 4x4 truck motor .
    HTH , Tom
     
  7. sled_dog

    sled_dog 1 ton status

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    ha yeah I know the answer, domed pistons /forums/images/graemlins/tongue.gif too bad I'm not pulling my motor apart just to swap out perfectly good pistons for others.
     
  8. alesko

    alesko Registered Member

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    btw, 450 hp at 7000rpm should be easily acomplished with fairly low compression. Shouldn't even need high octane.
     
  9. Triaged

    Triaged 1/2 ton status

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    Just put in some Vortec's. They have 64cc chambers and flow good. They will bump up your compression some but you should still be able to run pump gas with them. You can't beat that price!

    BTW: most domed pistons won't work with anything smaller than 64cc heads without some machine work.
     
  10. SUBFAN

    SUBFAN 1/2 ton status

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    I hope that HP rating is conservative.
     
  11. alesko

    alesko Registered Member

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    What are you going to run this engine in? The high output 305 heads work quite well with lower rpm torque motors. No need to worry all that much about big flow numbers unless you are in the high rpm range.
     
  12. sled_dog

    sled_dog 1 ton status

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    my buggy. torque is main concern but I will be letting loose the RPMs once in a while.
     
  13. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Second that, the Vortec heads are about $450 new for the set and flow great.
     
  14. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    ha yeah I know the answer, domed pistons /forums/images/graemlins/tongue.gif too bad I'm not pulling my motor apart just to swap out perfectly good pistons for others.

    [/ QUOTE ]

    Actually domed pistons are not the ideal setup. The ideal setup is a decked block with a tight quench and small chamber heads (and flat tops).
     
  15. alesko

    alesko Registered Member

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    Imo, the 305 heads will work well for that. I used a set a few years ago on a stock 400 with dished pistons and it ran real good. Dont know exactly what it bumped the comp up to but I had to run sunoco 94 to avoid detonation. The biggest advantage to me is cost. These heads should be a dime a dozen and with a LITTLE port work will work well. I stressed little because they have fairly thin castings.
     
  16. bablazer73

    bablazer73 1/2 ton status

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    [ QUOTE ]
    Actually domed pistons are not the ideal setup. The ideal setup is a decked block with a tight quench and small chamber heads (and flat tops).


    [/ QUOTE ] true, true. Flat top= best flame travel. Higher compression with less chance of detonation.
    What RPM range are you planning on spinning it to? I have used the 305 heads on some street engines. Good low RPM torque. with a little work, a decent head to play with. The vortec heads are nice. Less work to complete install. Do you know what pistons you have? do you know what the deck height is??
     
  17. alesko

    alesko Registered Member

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    We are talking compression and horsepower and all the up grades we have to do to get it. Funny that my honda civic is 410 horsepower with me just adding an exhaust and cold air system. And it is only 8:1 compression And I can prove it!
     
  18. sled_dog

    sled_dog 1 ton status

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    I have Speed Pro Hypereutectics with coated skirts. Flatops with 2 valve reliefs. Deck height is unknown to me. Didn't bother to check it, when the motor was built I wasn't into this stuff and didn't know any better. I think I will just wait till later and get some simple 64 or 60cc chambered aluminum heads. Want to drop some weight.
     
  19. ben427

    ben427 1/2 ton status

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    I'd like to see that /forums/images/graemlins/thinking.gif
     
  20. Thunder

    Thunder 3/4 ton status

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    If you want a good flowing 58cc head just get some GMPP LT4 heads. They should fit your needs if you dont mind spending some money.
     

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