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Thread: 1955blown sed del delema

  1. #11
    Registered Member BamaNomad's Avatar
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    Quote Originally Posted by TrifiveRichard View Post
    I believe the 400 bore (4.125) and 350 stroke (3.48) results in 373 cu in, close but has different performance characteristics. This generally results in a higher RPM (horsepower) motor, but typically less torque throughout the range, all else equal.
    And if you bore it 0.060", then you get close to '383' ci... which is what Bitchin was referring to... A very high-winding (larger) cube motor...

  2. #12
    Registered Member BamaNomad's Avatar
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    Quote Originally Posted by TrifiveRichard View Post
    question NCW, isn't a 383 a 350 block (.30 over) with a 400 crank? Why would it have a deck height different from a 350? What am I missing? Also, isn't there a tall deck 427, generally a truck block? Dick
    1st question: It doesn't have a deck height different than the 350 engine... exactly the same.

    2nd question: I believe there is such an animal as a 'tall deck 427'... so yes..

  3. #13
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    Quote Originally Posted by NCW View Post
    Ding Ding Ding - nope!

    Stock Chevrolet V-8 Block Heights

    Displacement Cubic Inches Liters Deck Height (inches)
    302 4.9 9.025
    305 5.0 9.025
    327 5.4 9.025
    350 5.7 9.025
    350(LT5) 5.7 9.025
    350(LS1) 5.7 9.240
    364(LQ4) 6.0 9.240
    383 6.3 9.025
    400 6.6 9.025
    396 6.5 9.800
    402 6.6 9.800
    427 7.0 9.800
    454 7.4 9.800
    502 8.2 9.800
    Read again I never said it was a tall deck I was asking a question because I was not sure. Pretty sure the 572 and bigger crate motors are based on tall deck stuff.
    Last edited by markm; 02-22-2018 at 03:58 PM.

  4. #14
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    Quote Originally Posted by chevynut View Post
    A 502 is not a tall deck block. If you're running a blower you could have other issues with it hitting the top of the cowl. If it was me, I'd drop the engine in and see where it sits the best, then build the mounts.
    The upper cowl issues come in to play with a tunnel ram, perhaps a blower too.

  5. #15
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    Traditional SBC engines were 9.025" block deck height.

    I think the confusion may have come from some LS engines being adjacent in the list, they are 9.24" as shown.

    Most big blocks are 9.80" as shown, including the 502. There are tall deck big block (10.20"). There were truck engines, 366" and 427", that were tall deck. The 572" GMPP engines are tall deck.

  6. #16
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    Back to the original question about how far forward you mount the engine, you basically have 3 basic choices.

    If you place the BBC with the back of the engine in the original location, you'll have serious firewall mods to do. But more room for the oil pan and front of the engine.

    If you move the engine 3/4" forward, you'll have minor firewall mods, you'll have to be picky about the oil pan (Milodon has one that fits), and you'll still have a bit of room for the accessory drive. This is probably the most common setup used.

    If you move the engine 2-1/4" forward, then your firewall will clear nicely, you'll have to have a modified oil pan or a dropped center link, and you'll be crowded in the accessory drive/radiator area.

    markm's comments about the tunnel ram and blower are also worth considering. Also the blower drive might be a problem at the front.

    It's all a balancing act. Kind of like stepping on a balloon. Each choice lead to more choices. There is no "right" way.

  7. #17
    Registered Member NickP's Avatar
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    Quote Originally Posted by BamaNomad View Post
    Of course all the 'std' passenger car big blocks have a taller deck than the 'small blocks'!

    All of the 'big blocks' you posted/listed are so-called short deck (big) blocks; IIRC, there ARE big block configurations (for large trucks I think?) which have a taller than 9.8" deck... I believe that is what CN was referring to... ?
    I'm uncertain what anyone intended by their retort/reply/post. All I did was to find a chart on the web that listed what was shown. Simply adding information. Yes, there are taller deck heights within the GM platform.
    Last edited by NickP; 02-23-2018 at 06:45 AM.

  8. #18
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    I have three of the cutout BBC pans, might part with one of interested.

  9. #19
    Registered Member chevynut's Avatar
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    IMO 2.25" forward is unnecessary to clear the heads and valve covers (unless they're really tall valve covers) and it reduces the space everywhere else by an additional 3/4" that's not needed. But it may be necessary for the blower to clear....I don't know. As I said, 1.5" will eliminate problems with the heads and valve covers using a stock firewall. Some guys have claimed to put a BBC in the stock location without modifyng the firewall, but I don't believe it.

    For reference, here's some pics of my 502 in my Nomad at 1.5" forward. The engine also sits a bit higher than stock and is at a 5.5 degree angle to clear the C4 steering rack so it's not a perfect comparison. At the stock height and angle there will be more clearance. The firewall was previously "massaged" to fit a BBC 1/2" forward. You can see the dents in the driver's side corner, near the master cylinder holes, and the passenger side setback was enlarged upward to clear the valve covers of a 427 I previously had in it at 1/2" forward.

    01170023.JPG

    01200018.JPG

    01200016.JPG

    Here's the driver's side looking straight across the firewall with the engine 1.5" forward. The passenger side is further back.

    20120302_0005.JPG
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  10. #20
    Registered Member chevynut's Avatar
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    I still say the best way to deal with the issue of engine placement, especially with tall valve covers and a blower, is to put it together and drop it in. Then determine how far forward you want to go. I'd even install the headers and accessories to make sure they clear everything.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

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