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Author Topic:   400 Chevy Block
Dirt Roller

Total posts: 17
posted October 07, 2005 11:14 AM  
I would like to know the maximum foot pounds of torque a stock 509 casting 400 chevy block will tolerate before shaking the main webs out of it. And what the block longevity is. We normally run from 4000 to 7000. I am looking at +600 ftlbs for next years motor.

Dirt Forum Champ
Total posts: 2007
posted October 07, 2005 11:55 AM  
Thats prob about 100# too much to expect any decent life out of it. I would consider the 509 prob the weakest of the 400 blocks. The 817 is prob the better one. Even then its on borrowed time if you try to push 600# through it and 7000rpms.

Dirt Forum Racer

Total posts: 100
posted October 07, 2005 03:18 PM  
i got a 509 shortblock for sale if ya central pa.... 509 is supposed to be the best 2 bolt 400 block....put a set of splayed mains on it and i'd push 600 through it anyday of the week all season long....a 377 would be even better

Dirt Roller

Total posts: 17
posted October 14, 2005 08:14 AM  
Thank You for the replies, you've confirmed what I suspected, I am going to have to upgrade to a Little "M"

A. Bighurry
Dirt Full Roller

Total posts: 35
posted October 14, 2005 09:03 PM  
I've been thinking of doing the same. For the peace of mind you get the cost is probably worth it.

nine finger
Dirt Forum Racer

Total posts: 76
posted October 15, 2005 03:04 PM  
the problem with the stock block is that they tend to split the rear cylinders.

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