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420A 420a Block vs Neon Block Strength

Posted by iNoise, Feb 21, 2020

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  1. iNoise

    iNoise Probationary Member

    29
    1
    Joined Apr 25, 2011
    PSL, Florida
    Pictures showing a 420a block from an eclipse and second photo from a 2000's neon. Think the added support in the passages are any benefit at all?

    420a.jpg Neon.jpg
     

    Street Build 293  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  2. motomattx

    motomattx Proven Member

    2,200
    848
    Joined Dec 9, 2010
    wampum, Pennsylvania
    It depends on how far down in the block they go, if its just up in the top its not going to do much.
     

    Drag Race Build 3K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. curt-s

    curt-s Proven Member

    795
    241
    Joined Dec 21, 2008
    Winterville, MB, Canada
    How many 420a motors before this change saw headgasket issues? I could see them adding webbing right up top to help guard against deformity when at the point of highest static compression, but if it doesnt run all the way down then peak cylinder pressure would still wreak the most havoc.
    if the webbing does run all the way down, what has that done in terms of coolant passage changes for flow paths or creating areas for coolant to remain mostly motionless?

    Then again, the motor wasnt designed for boost, was it?

    many questions, no simple answers
     

    Street Build 2K  1

    1991 Eagle Talon TSi
    fwd · manual · 1G DSM
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  4. RWD4G63

    RWD4G63 Proven Member

    375
    83
    Joined Dec 7, 2011
    Paw Paw, Michigan
    That will definitely help with deck stiffness.
     

    Road Race Build 230  3

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  5. ThunderChild

    ThunderChild Supporting VIP

    2,639
    783
    Joined Jan 5, 2012
    Rathdrum, Idaho
    Are we sure the deck hasn't been milled a little more on the top block pic? It's also got high-comp pistons, which makes me wonder if it wasn't cut down some for more effect, though it does seem that would be a lot of deck height cut out.

    Ill agree the extra webbing will increase deck stiffness though, even the small amount.
     

    Street Build 402  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    502  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    1K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  6. iNoise

    iNoise Probationary Member

    29
    1
    Joined Apr 25, 2011
    PSL, Florida
    Nah, thats how all the eclipse motors are (in the top pic). The stock motor that I pulled out before my bottom picture, looks just like the top one. Just not as clean :|
     

    Street Build 293  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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