Boosted One

iTrader: (6)

lol, thanks. I must have glanced over that.

O.N.

agreed in this photo yeah i'll take some pics of my engine and post them up, they look to be the same thickness all the way around the cylinder.
Did i get lucky and got a good block i dont know but mine looks fine nothing like the photo, although mine isn;t cutaway like the photo perhaps it might thin out i dont know. but from above at 4.185bore lsx454 crate motor it looks ok.

NA$TY-TA

iTrader: (21)

wow............

O.N.

Ok had a look inside the water jackets on my LSX454 today and it is the same as the picture from the PRI show someone else posted.

Basically the first 10mm are of a normal thickness and then you can see it humps in and is thinner the whole way down the bore.

It's thin i dont know why they would do that but it is and for N/A it will be fine.

kmracer

iTrader: (1)

you cant judge cyl wall thickness by looking at it, you need a sonic tester.

O.N.

yeah but all im saying is you can physicaly see it with your eye it is 1 thickness for about 10mm then its humps inward in a space of about 5mm and stays that thickness the wholeway down, you can clearly see it hump with your eyes.

It is clearly like this by eye and 100% gets smaller in thickness.

kmracer

iTrader: (1)

have you ever run this engine?

O.N.

are you talking to me?
if so yeah its my second lsx454 build at the moment both are N/A applications.

prostreetbuyer

My engine block was dimensionally defective having less than the advertised metal thickness. An important component of the engine block’s strength comes from having enough metal thickness to support a load.
The industry standard and Chevrolet’s standard for cylinder wall thickness is a minimum of .200 thousands of an inch. Summit Racing and Chevrolet’s own advertising for the lsx block states “maximum 4.250 bore at .200 minimum wall thickness”. My defective block had a intentional smaller 4.185 bore, hence the remaining cylinder wall thickness should have been .2325. However the sonic testing that was performed post-mortem discovered a bore thickness as little as .177 which effectively cheated me of .0555 thickness of metal or using a simple analogy in dollars, I was entitled to $232.50 but only received $177.00 dollars. A shortage of $55.50 or 24 percent!

ChevyChad

iTrader: (50)

Dude, you wont give up the fact that that max bore is for N/A applications. And the max bore is 4.200, not 4.25.

https://ls1tech.com/forums/14476280-post168.html

O.N.

lol ok so you had the dead engine block sonic tested then what did gmpp say about it?

Boosted One

iTrader: (6)

Trust but verify. It could be interpreted that GM is saying you can have a 4.250 bore as long as you have .200" wall thickness. So if you check the thickness first you can see if you can even get to that bore to begin with. A simple sonic test on engine assembly could have saved allot of agrivation and $$$ I have to admit I'm a little slack in that area myself. I tend to trust manufactures info more than I should.

trenaman

This thread has me shaking my head.. GM offers a N\A engine, the LSX454 and a boosted engine, LSX376.. Anyone thinking they can drop a bunch of boost on a the LSX454 should have done some research. There is a REASON GM says to boost the LSX376.. because that is what it is designed to do!! I have the LSX376 pushing 888rwhp out of it. Works GREAT, cost half as much as the LSX454.. Even on the corvette forum, I just laugh when people blow there LS7, which cannot handle more than 5-6psi.. They cry when they drop 9-10psi on it.. I bet the LSX454 may be able to handle 5-6psi max only with a spot on tune..

Believe it or not but GM engineers are smarter than you. This is why they have a boost friendly application available.. the LSX376.. and it delivers!

Ravenous T\A

iTrader: (12)

he has a good point, why would someone try and boost a high compression motor not designed for boost? Whatever happens is your own damn fault

Boosted One

iTrader: (6)

Wow, very impresive numbers Trenaman! Is that a 376 off the shelf, or did you change the heads/cam? Stock rod bolts?

littlefranks

i just took apart our 454 lsx block first gen cylinder #6 has a hairline crack.coolant leaked into cylinder detonated head gasket between 6 and 8.na motor made 685 rwhp.what do u do can the block be fixed?

Fbodyjunkie06

iTrader: (10)

Sounds like no matter N/A or boosted these motors had problems.

98Z28CobraKiller

iTrader: (17)

Not sure if you can sleeve an iron block but by the time you pay for the sleeves and the machine work, you'll likely be close to the retail price of a new block.

O.N.

you can sleeve it and no its doesn't cost all that much.

littlefranks

https://ls1tech.com/forums/picture.p...ictureid=77981