Thread: 400/406 Builds
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Old 03-15-2016, 12:21 PM   #114
burnin oil
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Join Date: Jan 2013
Location: Eastern TN
Posts: 1,919
Re: 400/406 Builds

I know the Dart block is strong but there is nothing wrong with a good factory block. The only one I have lost so far was full of water during the winter. She cracked hard. The motor in my truck was originally built when I was in high school and had the crap beat out of it. Finally busted 4 pistons. A few years later it was rebuilt again (good cylinder walls with no scratches so it stayed 30 over) and has seen way more 7k RPM shifts, not to mention the speed shift that the pedal stuck to the floor. 3 years later compression is still good but oil pressure is going down. I think it is worn cam bearings as I have swapped it 4 times on this build and it didn't show up until the Comp solid went in. Anyways that was all on the same 30 over block. I plan to shelf this one for now and put together a 509 block from 1974. If it takes 1/3 the abuse of the other 400 I will not complain. I think that 500HP is reliable for the factory block.
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