Tom@SpeedInc

iTrader: (5)

Simple answer, basically pour cement in the block.

http://www.hardblok.com/info.html

lstvr

I see, but the cooling???

Elcaballoloco

iTrader: (3)

In some instances like track only cars running alcohol which runs alot cooler you can get away with no coolant system but that's not too common.

What alot of people do is go with a 1/4, 1/2, or 3/4 fill. It lowers the cooling capabilitys but still keeps coolant flowing up top around the combustion area.

Filling a block also helps with cylinder rigidity at high rpms and has been proven to show power gains. At high rpms your cylinder is doing some crazy stuff and you may have issues with rings sealing properly at those high rpms. Filling a block reduces the problem as well.

lstvr

I see now, thanks for clearing that up for me chaps!

LS6

This thread is old, but i hope to find some information about the finding of sonic testing of the remaining wall thickness after boring to 4.125" of LQ9 or LQ4

bww3588

iTrader: (49)

All blocks will be different due to core shift and other casting differences. Sonic test your own block and bore accordingly.

LS6

where to buy sonic tester or checker...

bww3588

iTrader: (49)

Take it to a machine shop. They are too expensive to just buy and use once maybe twice.

87silverbullet

iTrader: (11)

Here you go. It's not like its 50 bucks but I think 330 bucks is still doable.

http://www.bulltear.com/catalog/prod...ucts_id=195%20

KCS

iTrader: (20)

I agree. Even if you do it yourself and get your measurements, you will still be right back on here asking what a minimum wall thickness is, and you will still get a dozen different answers. At least at a machine shop, you can explain your goals and they can give you a better answer based on experience.

01 blue ss

iTrader: (2)

I just want to know if there is enough meat in the cylinder walls to go 4.070 so I can use an LS3 piston in an iron block and boost it.

LS6

We done a sucessfully a 376ci (6.17 liters) engine using the LQ4 cylinder block, where we overbored the block to 4.066" and used the stock crankshaft. using milled 317 heads as N/A. The car working till now for three day with out any problems till now.

We checked with the machining shop, and they adviced there is sufficient thickness.

93Polo

iTrader: (5)

LQ4 block, crank, rods, heads are the same. Pistons changed, not sure about the cam

What year block? Is it an LY6? I understood the newer 6.0 iron blocks were heavier than the old ones. 4.06" in the early days required the block to be sonic checked. 4.125" on a truck block would make for an inexpensive 427.

KCS

iTrader: (20)

Yes. I went to 4.065" on mine so 4.070" won't be a problem.

LS6427

iTrader: (2)

I'm doing 4.030 bore, 4" forged crank and going 15psi, when I get thicker deck heads......20psi. Iron 6.0L.

.

01 blue ss

iTrader: (2)

So you think 4.070 and let's say 20 psi will be alright? The block will be well prepped, I'm just worried about cylinder wall thickness.

There will be no hard block though.

Hotrod406

iTrader: (6)

Apparently they never sonic tested that block or it was so thin they didn't want to disclose the results.

KCS

iTrader: (20)

20psi is enough boost that I would have it checked at least to see what it is, but I do know of similar setups that worked.

bww3588

iTrader: (49)

With blocks and casting differences, it's hard to base things like cylinder wall thickness, deck height and other stuff off someone else's block.

LT1PWRD

iTrader: (2)

Just wanted to see if there were any sonic check results after a 4.125 overbore.
I believe .200 wall thickness is the safe N/A minimum.