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Old 04-04-2012, 12:07 AM   #1
MI Racer
Status: Junior Member
Join Date: Nov 2010
Posts: 14

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
Status: Junior Member
Join Date: Jan 2012
Posts: 14


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
Status: Veteran Member
Join Date: Oct 2007
Posts: 507


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

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Old 04-05-2012, 02:11 AM   #4
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Join Date: Oct 2010
Location: Brookings, SD
Posts: 153


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.
Your connection to performance, We carry every part for horsepower.

http://www.youtube.com/watch?v=8oT-LgyvXEg Blown 565 BBC 1300+ Horsepower
http://www.youtube.com/watch?v=4gRvR5G2Q8k LS7 441 Stroker 703 Horsepower
http://www.youtube.com/watch?v=YNqBYtwZ0JY SBF 438 1270 Horsepower Nitrous Engine
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