Ls7 454

Discussion in 'Engine Topic' started by Southern72, Apr 17, 2006.

  1. Southern72

    Southern72 Veteran Member

    Mar 2, 2005
    While at a friends house i discovered he has a real LS7 454 that he bought brand new years ago.He took the original iron heads off and put gm racing alluminum heads on. He was planning on drag racing the motor but never did.This motor is 12-1 compression.And has been sitting in a garage for a long time but has never been run. He took out the original LS7 solid cam and replaced it with a bigger one but still has the stock cam.What do i have to do to this motor to run it? I will put a smaller cam in maybe the stock LS7 cam but what compression can i run on premium pump fuel. Keep in mind this car will never be a daily driver.
  2. kirbi69

    kirbi69 Veteran Member

    Jul 12, 2003
    Austin, Texas, USA
    i thought the ls7 was a 427, from the late 60's vette and the ls6 was the 454
  3. Southern72

    Southern72 Veteran Member

    Mar 2, 2005
    From what i read the ls7 was scheduled to replace the 427 vette motor but emmisions stopped it mid production. the motor option even made it in the vette brochure.chevrolet then sold them as crate engines.
  4. pdq67

    pdq67 BANNED

    Jul 26, 2001
    Columbia, MO, USA
    The 454 was both, an LS-6 and a never sold in a car, LS-7.

    LS-6 was 11.25 to 1 CR. with just the .520" gross lift solid cam in it! The LS-7 was 12.5 to 1 CR. with a big .560"/.600" gross lift solid ZL-1 type cam in it..

    Can you say 600+ hp uncorked and ready to boogie!!

  5. Southern72

    Southern72 Veteran Member

    Mar 2, 2005
    He said it was good for over 600hp as is. I would like 500hp and pump gas friendly with a cam that is streetable.So how much compression do i have to lose to make it live on 93 octane.
    Last edited: Apr 17, 2006
  6. theflash

    theflash Veteran Member Lifetime Gold Member

    Feb 27, 2004
    Podunk, CT
    12-1 compression is not pump gas friendly. At least not todays gas, back when that motor was made you could still buy 100 octane gas.
  7. ZS10

    ZS10 Moderator Lifetime Gold Member

    Jan 18, 2003
    BC, Canada
    Everyone will have their own opinion on this, but mine is 500hp is easy to get with a 9.5:1 454. No need for exotic anything. Flat tappet hydraulic cam, a decent alum dual plane, (or single plane if you need to kill some bottom end). Stock oval port iron heads with a decent valve job and maybe some port work. Great street manners, runs on regular and be thankful its cheaper, you're going to burn lots. When you get bored with the power, put some nitrous into it.
  8. 70RS/SS396

    70RS/SS396 Veteran Member

    Jul 18, 2005
    Keep the engine as is it, onley change pistons to a little more pump gas friendly. You will still problably have 500-600 hp, depends on the camshaft. If you takes the original cam you have at least 500++ hp.

    BIGBADBOWTIE Veteran Member

    Dec 9, 2003
    Huntsville, Alabama
    There was also an LS5.....
  10. camrs73

    camrs73 Veteran Member Lifetime Gold Member

    Jan 3, 2000
    yeah 454/390?hp hyd cam, more of an A/C car motor i believe

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