Sonic Check How does this block look?

[kamkuda]

500 inch Mopar crate engine block  4.380 Non siamese bore but with cross bolted mains block.
Estimated Hp 800 or a bit more

The O represents the cylinder.
measurement at 1.5 inches

Outside  Inside       Inside   Outside
.278   O   .360       .373   O   .315
.290   O   .364       .425   O   .333
.280   O   .367       .410   O   .349
.298   O   .358       .414   O   .357


measurement futher down the bore
Outside  Inside       Inside   Outside
.222   O   .282       .249   O   .230
.242   O   .280       .264   O   .228
.248   O   .285       .293   O   .190
.250   O   .271       .330   O   .180

[heyoldguy]

If the .180 & .190 are on cylinders 1 & 3, I'm not using that block. If those are 6 & 8 it's marginal at best. Generally we like to see twelve measurements in each cylinder, 4 each at the top, middle and bottom. It is best to know the piston pin sides also as they seem to be the thinnest. I don't think it's a real good block for 800 HP.

[Challenger340]

In your numbers, where is the "front" and "rear" of the Block ? ........which determines "major" thrust sides.

On the even 2-8 bank, the "outside" walls see the Major Thrust....
On the odd 1-7 bank, the "inside" walls see the Major Thrust....

IMO,
Below .220 on any "Major" thrust side, especially with lower ratio strokers, is asking for trouble.

[firefighter3931]

Rob, as Challenger340 said : what is front and what is rear of the block ? The .180 & .190 measurements are in the middle of the cylinder or at the bottom ?

If those .180/.190 numbers are on the minor thrust side at the bottom of the cylinder you should be able to get away with a low fill (hardblock) and still be fine, inmo. 

Kevin is running a stock block with a partial fill on his blower car with no overheating issues on the street. 



Ron

[kamkuda]

The first numbers are at the top of the block about 1.5 inches
and the second numbers are at the bottom half of the block

This is the orientation
8   7
6   5
4   3
2   1

[firefighter3931]

The first numbers are at the top of the block about 1.5 inches
and the second numbers are at the bottom half of the block

This is the orientation
8   7
6   5
4   3
2   1

So the minor thrust on #1 & #3 are the thinnest at the base of the cylinder.....that's the best case scenario, inmo. 

There are two options ;

(1) sleeve those 2 cylinders
(2) short fill with hardblock



Ron

[heyoldguy]

Rats!  I did, I got it backwards! I'm glad you caught that.

How thick of a sleeve can you put in a block? 'Cause the only book I have available to me doesn't list anything thicker than .120". Does somebody make a .250" thick sleeve? If you can't get a sleeve thicker than the wall you are trying to beef up, it would seem the only option woud be to fill the block. As there is only about .430" between cylinders 1 & 3, a sleeve thicker than the existing wall doesn't even seem to be a viable choice.