400 block question?

Old 03-08-2011, 07:00 PM
  #1  
Prater22
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Sep 2010
Posts: 5
Default 400 block question?

I baught a 400 engine casting number 3951509 that is punched .060 over is this safe for a dirt modified? Let me know what you think.
Prater22 is offline  
Old 03-08-2011, 07:05 PM
  #2  
fla1976
Senior Member
RACING JUNKIE
 
fla1976's Avatar
 
Join Date: Aug 2007
Posts: 1,534
Default

One way to know is to have it sonic tested.
fla1976 is offline  
Old 03-08-2011, 07:14 PM
  #3  
hillzmod
Junior Member
SHOW GUEST
 
Join Date: Mar 2011
Posts: 1
Default

what is sonic tested and where can it be done at
hillzmod is offline  
Old 03-09-2011, 02:58 AM
  #4  
JEFF69Z28
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2008
Posts: 496
Default

509 BLOCK I THINK IS THE WEAKEST OF THE FACTORY 400 BLOCKS.
BECAUSE OF THE 4 BOLT BEARING CAPS.
JEFF69Z28 is offline  
Old 03-09-2011, 03:35 AM
  #5  
mbaker3
Junior Member
SHOW GUEST
 
Join Date: Dec 2007
Posts: 1
Default Sonic Testing

Here is a brief article explaining what Sonic Testing is.

http://racingarticles.com/article_racing-73.html
mbaker3 is offline  
Old 03-09-2011, 04:32 AM
  #6  
hink
Senior Member
EXPERT BUILDER
 
Join Date: Nov 2003
Location: NORTHEAST
Posts: 290
Default

Originally Posted by fla1976
One way to know is to have it sonic tested.
X2!!!!!!!!!!!! and at the bore on a 400 block there is a good chance of cracking from the head bolt hole to the cylinder.

Look it over close
hink is offline  
Old 03-09-2011, 05:24 AM
  #7  
wrightway
Senior Member
SENIOR BUILDER
 
Join Date: Feb 2005
Location: LAWTON MI
Posts: 113
Default

Originally Posted by JEFF69Z28
509 BLOCK I THINK IS THE WEAKEST OF THE FACTORY 400 BLOCKS.
BECAUSE OF THE 4 BOLT BEARING CAPS.
not all 509s are 4 bolt
wrightway is offline  
Old 03-09-2011, 02:02 PM
  #8  
pistonpopper
Junior Member
SHOW GUEST
 
Join Date: Nov 2008
Posts: 9
Default

i heard that that some shops drill the steam holes, thread them and plug them,to prevent cracking in this area, for drag race use. any experiences with this? i believe that a 509 block is one of the stronger 400 blocks. i have one in my garage now that is a two bolt block that has been studded,line bored, and filled to the bottom of the frost plugs.
pistonpopper is offline  
Old 03-09-2011, 07:32 PM
  #9  
markdunlap
Senior Member
DYNO OPERATOR
 
Join Date: Jan 2004
Location: central Illinois
Posts: 459
Default 400

To see what is required to add life to the head deck of a 400, you may want to check out the old Bill Jenkins smallblock chevy engine building book.

It details how to drill, tap, and plug the steam holes. It also shows to add plugs with holes in them to the big water holes in the deck and mods to other water holes.

I followed this once and the 400 block lived 7 full seasons of drag racing. It eventually cracked from a head bolt hole to the bore. Rest in Peace.
markdunlap is offline  
Old 03-09-2011, 07:37 PM
  #10  
pistonpopper
Junior Member
SHOW GUEST
 
Join Date: Nov 2008
Posts: 9
Default

mark, were you using studs,or bolts in the decks of that block?
pistonpopper is offline  

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service