400 sbc 2 bolt main suggestions?

Old 11-21-2010, 05:44 PM
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Drtmod5
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Default 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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Old 11-21-2010, 07:00 PM
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mytmouz
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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...
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Old 11-21-2010, 10:36 PM
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hink
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Default Re: 400 sbc 2 bolt main suggestions?

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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Old 11-22-2010, 06:46 AM
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DirkaDirka
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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.
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Old 11-22-2010, 07:03 AM
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hammertime
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The 509 casting blocks are suppose to be the best of the bunch. If its not I wouldnt use it
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Old 11-22-2010, 02:23 PM
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Tod74
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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.
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Old 11-22-2010, 03:13 PM
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kwkracing
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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!
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Old 11-22-2010, 03:25 PM
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jasonwfo1
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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.
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Old 11-22-2010, 03:26 PM
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Drtmod5
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It's a 511 block #, and we run under UMP rules. Thanks for the replies.
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Old 11-22-2010, 04:52 PM
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Tod74
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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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