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Old 04-04-2012, 12:07 AM   #1
MI Racer
 
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Default 400 or 509 block

Pro's/Cons? I have my eye on a 406 with a 509 block and don't know much about them. Thanks.
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Old 04-04-2012, 02:04 AM   #2
Lickity-Split
 
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Of the factory 400 blocks, either the 509, or the 817, is the one you want.

Between 450 and 600 horsepower you'll want to drill and add some steel 4 bolt main caps if yours isn't already done.

Anything more, and you'll want to get a Little M, or an SHP.
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Old 04-04-2012, 12:11 PM   #3
CNC BLOCKS
 
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I am not very fond of 400 blocks I have one in the shop that has a spun cam bearing the other shop put splayed caps on went into the water jacket, It appears it was never plate honed, also the lifter bores are out of round up to .001 The customer is fine with everything as he is putting it together.

Here is another link to go over had that guy all figured out!! SAVE YOUR MONEY AND BUY AN SHP OR AN SHP PRO BLOCK AND NEVER LOOK BACK

http://www.stevesnovasite.com/forums...d.php?t=185248
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Old 04-05-2012, 02:11 AM   #4
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There is nothing good about a 400 block for a performance application. By the time you fully machine the old 400 block, you could buy a new Dart SHP Block. The SHP block is the hottest block on the market right now.
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