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    Author Topic: What compression ratio does a 440 have?  (Read 2403 times)

    Offline TinCuda

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    What compression ratio does a 440 have?
    « on: August 12, 2011 - 09:56:46 PM »
    What did the 1970/1971 440-6 have for a bone stock, completely unmodified compression ratio?

    Thanks,



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    Offline DAYLEY/CHALLENGER

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    Re: What compression ratio does a 440 have?
    « Reply #1 on: August 12, 2011 - 10:01:11 PM »
    Well the 4barrel had 9.7 to 1
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    Offline GranCuda1970

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    Re: What compression ratio does a 440 have?
    « Reply #2 on: August 12, 2011 - 10:46:20 PM »
    I thought It was 10.5 to 1.
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    Offline TinCuda

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    Re: What compression ratio does a 440 have?
    « Reply #3 on: August 13, 2011 - 02:56:00 AM »
    I was thinking the 4 barrel had 9.5:1 and the six pack 440 had 10.3:1 but I don't know that as fact.   Does any know for sure or can point me to a reliable source?

    Thanks


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    Offline Super Blue 72

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    Re: What compression ratio does a 440 have?
    « Reply #4 on: August 13, 2011 - 03:51:40 AM »
    Quote from: TinCuda on August 13, 2011 - 02:56:00 AM
       Does any know for sure or can point me to a reliable source?

    Thanks


    .,

    Maybe an old service manual?  :dunno:
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    Offline Chryco Psycho

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    Re: What compression ratio does a 440 have?
    « Reply #5 on: August 13, 2011 - 09:17:35 AM »
    they have a flat top piston so it will be around 9.8 : 1 , even with the piston zero decked you barely get 10:1 & the blocks are always taller so it is never zero deck height
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    Offline TinCuda

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    Re: What compression ratio does a 440 have?
    « Reply #6 on: August 13, 2011 - 01:41:22 PM »
    Thanks again Chryco!


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    Offline DAYLEY/CHALLENGER

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    Re: What compression ratio does a 440 have?
    « Reply #7 on: August 13, 2011 - 06:58:29 PM »
    My info came from Hot Rod magazine page 38, December 1969 issue and an article on the 1970 Challenger...BRUTE FORCE...  4.32" X 3.75" Bore and stroke.  By the way.......gas miledge...best...13.06 mpg and worse...10.52mpg. :bigsmile: :bigsmile:
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