Need block suggestions! Having issues

[shmiet]

What I am thinking is that the walls were too thin to begin with and with the light boost it split. They said they had no idea why it would break that bad but the only thing I can come up with is really thin walls. My engine builder wants me to go to a 4.8 just for the wall thickness to get a bulletproof setup. Ive already spent about $16000 on this project and I'm pretty sick of it. I am glad Thompson gave me a warrantied engine but when I sent it back they kept my head dowels($22 in Canada for 4) and they didnt clean out my oil pump or give me a new one. I pulled it apart myself to get the particulate out. Im really not too pleased

And to top it off I'm stuck with a $3500 short block that I cant boost

[chvy=power]

yea that sucks. The 5.3 and 4.8 use the same block. The 3.902" is the pushing it on the 5.3 block imo. Iv always ran a 3.89" (factory ls1 bore size) bore when i punch out a 5.3 block and never had any problems

[shmiet]

Hmm, so do you think I should do the iron 6l or bore out my scored 5.3 to 3.89"?

[chvy=power]

Do you already have an iron 6.0?

[ImportThis]

You probably could of built a 370 or 408 for what the iron 5.7 cost.

[George C]

Plenty of ppl made power with a iron57

TMS may just not have their A game going on
Also you get what you pay for..if a motor price is too good to be true it probably is

I wouldn't run a TMS motor

[shmiet]

Well its a little late not to run the motor haha. And as far as getting what I payed for goes, I've heard similar stories from guys who have bought LSX blocks and had similar problems within 10 min of running it.

[chvy=power]

Plenty of ppl made power with a iron57

TMS may just not have their A game going on
Also you get what you pay for..if a motor price is too good to be true it probably is

I wouldn't run a TMS motor

+1

[shmiet]

Do you already have an iron 6.0?

Ya I have it. Its been blasted so Ill do a slight bore and go from there. Neil @ Horsepower Solutions up here is telling me that its the way to go, considering he's got one of the fastest quarter mile LSX cars out there I'm gonna take his word for it haha.

[pl4yboy]

What I am thinking is that the walls were too thin to begin with and with the light boost it split. They said they had no idea why it would break that bad but the only thing I can come up with is really thin walls. My engine builder wants me to go to a 4.8 just for the wall thickness to get a bulletproof setup. Ive already spent about $16000 on this project and I'm pretty sick of it. I am glad Thompson gave me a warrantied engine but when I sent it back they kept my head dowels($22 in Canada for 4) and they didnt clean out my oil pump or give me a new one. I pulled it apart myself to get the particulate out. Im really not too pleased

And to top it off I'm stuck with a $3500 short block that I cant boost

Your engine builder doesn't know the 4.8 blocks are the same as the 5.3... not much of an engine builder.

you skimped on pistons, you skimped on the block... what do you expect?