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Thread: 400 sbc 2 bolt main suggestions?

  1. #1
    Senior Member MASTER BUILDER
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    400 sbc 2 bolt main suggestions?

    I recently picked up this standard bore block for next to nothing. I have heard the horror stories about these 400's, but am curious as to what others think before I possibly waste my money. This motor will be a circle track motor so filling the block won't be an option. Is it worth the time or should I stay with another 383-388 combo like I have now? Any help is appreciated.

    Thanks, Dave
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  2. #2
    Senior Member RACING JUNKIE mytmouz's Avatar
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    Are the aftermarket blocks available now better? Yes. Did the stock stuff work for years when the aftermarket stuff wasn't available? Yes. Personally, if I had the stock block, I would install the splayed caps and run it. I have a production block in mine now, and just got a heck of a deal on a little m crate motor that didn't live. I ain't pulling the motor out just to change the block...
    If you think nobody cares, try missing a payment...

  3. #3
    Senior Member EXPERT BUILDER
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    Re: 400 sbc 2 bolt main suggestions?

    Quote Originally Posted by hambone82
    I recently picked up this standard bore block for next to nothing. I have heard the horror stories about these 400's, but am curious as to what others think before I possibly waste my money. This motor will be a circle track motor so filling the block won't be an option. Is it worth the time or should I stay with another 383-388 combo like I have now? Any help is appreciated.

    Thanks, Dave
    Before you spend any money on that block have it sonic tested first!!
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  4. #4
    Senior Member RACING JUNKIE DirkaDirka's Avatar
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    I got one in my 84 Chevy 4x4 and right now I am having a hard time keeping it cool. I dont know if that is a problem with the 400s or not. I know that the one in my 4x4 has a mild cam and around 10:1 compression. I didnt build the motor or have it built so I cant tell you everything that has been done to it. I do have a set of Hooker Headers with 2 1/2" exhaust into dual flowmasters. It sounds good and runs good jsut need to figure out my overheating problem.
    Its all fun and games till someone loses a nut!

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  5. #5
    Senior Member RACING JUNKIE
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    The 509 casting blocks are suppose to be the best of the bunch. If its not I wouldnt use it
    David Lanning
    IHRA NHRA 387B

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  6. #6
    Senior Member RACING JUNKIE
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    I never had one iota of trouble keeping an 11 to 1 compression 406 cool on the street. Ran 180 in traffic. I've had 3 different 406's in street cars none of them ran hot. I think that is just a myth.

    x2 on the 509 being the best one. That's what they say.

  7. #7
    Senior Member RACING JUNKIE
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    If your runing a imca class that is using a stock block, you will have no troubles, the engine will tear up of other reasons, before you should worry about the block or mains. Put a some arp studs and go racing!

  8. #8
    i ran a 434 in a 511 block for a few years, the 400 blocks like to crack from the upper head bolt holes to the larger 1/2 inch circle water passages, i seen this in bone stock 400's,check yours, would almost bet you will find a crack.

  9. #9
    Senior Member MASTER BUILDER
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    It's a 511 block #, and we run under UMP rules. Thanks for the replies.
    http://i399.photobucket.com/albums/p...ber13417-1.jpg

    SEMPER FI!

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  10. #10
    Senior Member RACING JUNKIE
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    I thought the 511 was the 3 freeze plug 4 bolt main casting? they are the ones with the worst reputation. all mine were 4 bolt main 3 freeze plug blocks. only street motors though.


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