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Thread: 400 Build

  1. #1
    Member JOURNEYMAN
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    400 Build

    Quick question with the stock block filled to the bottom of the water pump holes how much horsepower can it hold this will be a strip only motor. also can you fit a 3.875 or a 4.00 crank in the stock block with some clearancing?

  2. #2
    Senior Member DYNO OPERATOR
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    HOW MUCH HP DO YOU THINK YOU'LL HAVE?IS IT A STOCK BLOCK? 2 0R 4 BOLT MAIN 2 BOLT MAIN IS THE STRONGER OF THE 2.?MINE MAKES OVER 600 WITH NO FILLER AND I HAVE HAD NO PROBLEMS YET.
    JUST MY 2 CENTS WORTH.

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
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    We have a 406 filled that makes 702hp. You need to sonic test the block and look for thin spots in the cylinder walls and prepare yourself for things to move around. I think a better option would be one of the new SHP blocks. They may seem pricey but by the time you have all of the machine work for splayed caps and such you will be very close to what you can buy one for. JMO.

    3.875 OR 4.00, small base circle cams, SJ rods, 3/8" rod bolts, stroker clearanced rods, lots of time grinding and fitting. It can be done but it is not easy. My 2 cents.

    Curtis

  4. #4
    Member JOURNEYMAN
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    its a two bolt the block is bored .30 over sonic tested line honed ready to go im going to stud it so i would be happy around the 650 hp mark. it has all forged internals only thing left to get is cam and heads if anyone has any suggestions on that to get to 650 im all ears. thanks for the reply.

  5. #5
    Senior Member RACING JUNKIE
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    I think i'd stick with the 406" setup, it's a lot easier. You'll need a .900 BS or smaller cam, somewhere between .630 and .650 lift on 106 lobe C/L solid roller. The Dart steel heads make good power and are cheap by comparision, 1 7/8" headers. I have 2 also 1 is a 4 bolt the other is a 2 bolt. I fill them to the bottom of the water pump, studded both. I go one step further. I tap the steam holes and put 1/16" pipe plugs in them, this helps keep the bolt holes from cracking to the steam holes. 650 is fairly easy to reach with a 406" motor with a good tune up.

    JMO

    Zip.

  6. #6
    Member JOURNEYMAN
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    thanks for the info zipper06 one last question would you put splayed caps or just stud the 2 bolt. I may hit with a 150 or 200 shot every now and then.

  7. #7
    Senior Member RACING JUNKIE
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    I didn't/don't put splayed caps on them, i do use studs on everything i build or run. There is a main gurdle that sells for about $70.00 for the 400 blk. it kinda keeps the webs from moving around. I also run 350 main bearings cranks with bearing spacers and drill a 1/8" hole in the upper bearing to get more oil to the mains. I drill that at 45 degrees from the top oiling hole. All the bearing spacers that i have seen have the top half grooved.

    Zip.

  8. #8
    Member JOURNEYMAN
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    Thanks.

  9. #9
    Senior Member EXPERT BUILDER
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    potash country
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    My Altered has a stock GM 400 block with splayed main caps,methanol injected, .630 lift cam with 1.60 rockers,13.5:1,Brodix 11X heads.....680 to 700hp. Runs awesome! See et below
    If a 5 lb hammer can't fix it,it must be electrical
    Keep the shiney side up! 8)
    http://www.racingjunk.com/profile/85221

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by doorracer
    We have a 406 filled that makes 702hp. You need to sonic test the block and look for thin spots in the cylinder walls and prepare yourself for things to move around. I think a better option would be one of the new SHP blocks. They may seem pricey but by the time you have all of the machine work for splayed caps and such you will be very close to what you can buy one for. JMO.

    3.875 OR 4.00, small base circle cams, SJ rods, 3/8" rod bolts, stroker clearanced rods, lots of time grinding and fitting. It can be done but it is not easy. My 2 cents.

    Curtis
    Excuse me for being off subject here but - Curtis, in your avatar what are you sitting in?

    A helicopter or is that one of them modified storm chaser deals.

    Cp
    ***IN GOD WE TRUST***


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