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What is a 350 bored 0.40 over?

Discussion in 'The Garage' started by CHEVYDADDY, Oct 28, 2008.

  1. CHEVYDADDY

    CHEVYDADDY 1/2 ton status

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    a motor yeah i got ya there! wht would it equal or close to what?
    i have a short block together needs some cleaning and have heads together need some cleaning wht should i use to clan and how should i go about doing it? wire brush our spary gunk and wip off or even water??
     
  2. Duntz00

    Duntz00 1/2 ton status GMOTM Winner

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    358 is a .40 over 350
     
  3. shaun89

    shaun89 1/2 ton status

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    ya, just some engine degreaser/kerosene/diesel would work good with a wire brush and lots of scrubbing,i would somehow tape or block off the cylinders to keep and the flying crap out of them.
     
  4. Stomis

    Stomis Professional Amateur Premium Member

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    I always thought it was a 357?
     
  5. 80' 427

    80' 427 1/2 ton status Premium Member

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    actually .40 is 423.316
    .040 is 356.880
     
  6. 1977k5

    1977k5 3/4 ton status Vendor

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    (4.040in/2)^2 * 3.14 = 12.819 in^2

    12.819*3.48 = 44.610 in^3

    44.610 in^3 * 8 cylinders = 356.88 in^3
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Bore x Bore x Storke x .7854 x number of cylinders = CI. 350 .040" over is a 356.88 or 357. :D
     
  8. CHEVYDADDY

    CHEVYDADDY 1/2 ton status

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    what is suggestable horse power for 357?
    can a 350 motor be borad to a 400? how much would it take?
     
  9. buffblazer

    buffblazer 1/2 ton status

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    for horsepower its gonna all depend on your set up.

    what heads
    cam
    roller or hydro lifters
    inkake
    carb
    serp set up or stock
    any emissions
    headers

    lots of stuff play into how much horsepower your gonna make with a .40 motor

    mine is .40 with flat top pistons, stock heads with hydro lifters, comp cams extream 4x4 cam, performer intake and 600cfm edlebrock carb with headers and a regular v belt set up with no emissions. is that similar to what your gonna be running?
     
  10. CHEVYDADDY

    CHEVYDADDY 1/2 ton status

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    yes i traded ariding lawn mower for a short block all together and matching heads i have to clean both but not sure on all details sounds goods
     
  11. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Power is made in the head and cam selection. Most 350's stock put out around 180-210hp.

    No, you cannot bore a 350 block out to make a 400. A 400 bore is 4.125".
     
  12. CHEVYDADDY

    CHEVYDADDY 1/2 ton status

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    headers
    no emissions
    600 cfm
    v-belt
    heads 626862 (didnt write it down)
    block and heads go together
     
  13. CHEVYDADDY

    CHEVYDADDY 1/2 ton status

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  14. rob h

    rob h 1/2 ton status Premium Member

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    i took a 74 350 and had it bored .040, decked, maged, line honed, i bought a crane 535 lift cam, comp 1.6 thought 1.7 but no 1.6 roller rockers, domed keithblack pistons 12:1, eagle crank and rods, and bowtie heads with 2.055 stainless valves, comp springs,titanium retainers. melling oil pump, elelbrock rpm airgap intake, holley 750 dp jetted down , holley red fuel pump, all arp bolts, summit 7 qt pan, mallory unilite dist, taylor wires, 1 5/8 primary tubes on headman headers, 3inch ball flanges and 3inch all the way out the back....and ill tell ya its an animal behind my 465 with 456 gears..i have no idea the horsepower range but with 37s i can go 30 and stand on it and burn em off in 3rd gear..
     
    Last edited: Oct 29, 2008
  15. Wasatch K5

    Wasatch K5 1/2 ton status

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    I think the 400 blocks from the factory did not have cooling passages between the cylinders and that's why they could be bored to 4.125.

    If you tried that with a 350 block the cylinder wall thickness would be too thin after boring.
     
  16. jt512

    jt512 1/2 ton status Premium Member GMOTM Winner

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    400's also had a longer stroke crankshaft which adds ci's
     
  17. 6.2Blazer

    6.2Blazer 1/2 ton status Premium Member

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    First of all, it's 0.040" overbore, or "40-thousands" of an inch not 0.40" (almost 1/2 inch).

    A .040" overbore motor will make the same power as a .030" overbore motor, an .060" overbore motor, or a one with no overbore, assuming everything else is equal.....any power difference between them is more likely because of a difference in tolerances of other components. Doing an overbore on an engine is not a performance modification, it's simply done to clean up the cylinders from years of wear and tear when you rebuild it. It's kind of like turning down a brake rotor, you do it because it gives you a nice smooth surface again not because it makes it work better than a new un-turned rotor.

    Sorry for the slight rant, but this is just one of my pet-peeves.
     
  18. jt512

    jt512 1/2 ton status Premium Member GMOTM Winner

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    rant away man, i hear you:D . I used to run a motorcycle shop and it would drive me nuts when people would come in asking about how much it would cost to put a "powerband" in their bike. Generally it was people that owned older 4-strokes and had just ridden a 2-stroke for the first time:confused:. trying to explain exactly what a "powerband " was and the difference between a 2-stroke and a 4 was enough to drive you nuts!

    oh, i think the correct answer to "what is a 0.40 over 350?" ........scrap!:D
     
  19. 4xcrazy

    4xcrazy 3/4 ton status

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    got any of those "powerbands" for my .030 overbored 350? :D
     
  20. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 400 block is a complete different casting all together as it also has larger main bores than any other SBC ever made.
     

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