400 block question
 

I got this 70’ 400 block from a friend who passed away he ran super stock does this look like it has been O ringed or sleeved?

Those round circles look like o-ring grooves?
Are they a groove or just marks left from a gasket?


What is the engine code for the block?


:confused:

They are raised grooves from what I can tell the block has been machined at some point.

If they are raised it probably is sleeved?
Usually they are milled flush with block.

Looking at the underneath pic, it could be sleeves. They will not fill the bore all the way to the end usually.
Is there a step at the bottom?


:confused:

Looks like my O-Rings. My block had also been sleeved in one cylinder and that stepped space on the bottom looks same. Make sure you remove the o-rings and save them when you hot tank the block.

https://forums.maxperformanceinc.com...1&d=1782308054

does that one have 4 bolt caps or 2? looks like its a ceapshoot with that casting 400.

Looks like they do have step at the bottom and the o rings are raised slightly. It is a 4 bolt 400 block

What are your opinions on a sleeved block for street use?

I have no problem with them. If done right.


:)

Fill the block to below freeze plugs if you are concerned. I run mine and its keeping at 180 temp when my fans and water pump are working!