Yet another overbore question

[sd_iconoclast]

Ok. I got the sonic test results via the phone. They guy said that he wants go to 30 over on the 3400 block. He said that 30 over leaves plenty of room to be safe. He said we could of gone over more if we wanted to. But he said the walls were a little thin in certain areas and once again that a 30 over is very safe.

But what were the the actual measurements?

[mfuller]

So if you bore a 3400 block .020" (or .030") over, what do you use for head gaskets? Maybe 3500 not-VVT gaskets?

[tejohnson]

If you go .020 - .030 over, you should be able to use stock gaskets. The stock gasket bore is about 3.715" You would end up seeing a bit of a rise in the compression ratio tho...

[blackbombshell95]

I can get teh exact measurements

[sd_iconoclast]

I just received the results of the sonic testing on my 3100 block. I will give 4 measurements for each cylinder, Front, Right, Rear, Left. The right will be the odd side of the block (towards the odd cylinders).

Cyl #1 -Front: 169 Right:225 Rear: 175 Left: 243
Cyl #2 -Front: 181 Right:214 Rear: 181 Left: 226
Cyl #3 -Front: 174 Right:167 Rear: 187 Left: 259
Cyl #4 -Front: 168 Right:218 Rear: 168 Left: 248
Cyl #5 -Front: 160 Right:213 Rear: 189 Left: 233
Cyl #6 -Front: 177 Right:207 Rear: 182 Left: 232

Conclusions:
1]even with a .120 overbore, the thinnest part of this block would still be .100 thick. My machinist is confident that this is thick enough.

2] My measuring method is not that great. My measurement of the rear of cylinder #6 is off by .028

Blackbombshell95 - posting your exact measurements of the cylinder wall thickness of your 3400 would be very helpful.!

[IsaacHayes]

what does the displacement work out to on .03 /.06 overbore on a 3400? How much does the compression raise?

[blackbombshell95]

I'll call my engine guy and see if he has the specs

[EspanolaGuitarista]

Iconoclast:

How do you figure a .120 overbore. You can only bore to the minimum of the thinnest cylinder. 0.080 Would put you at .080 at the thinnest cylinder. Your pushing the limits. I would suggest filler support. Is the length supported or unsupported?

[RacerX11]

How do you figure a .120 overbore. You can only bore to the minimum of the thinnest cylinder. 0.080 Would put you at .080 at the thinnest cylinder.

0.120" overbore only takes 0.060" from the wall thickness.

[EspanolaGuitarista]

Haaa!

Sorry, my right brain wasn't working. My bad.

[blackbombshell95]

http://60degreev6.com/gallery/showimage.php?i=318&c=6