How much trouble did I buy myself?

[NC_John]

Originally Posted by Bobbed72

Feel I'm in the same boat. If i take it for a hot tank and the machine shop tells me it should be bored I'll just be like "make em as big as you can"

My guy advised me to go the minimum overbore to clean it up. He said "we are putting a lot of money into this block (I did ALL the machine work to prep it right)- if we go max bore now you the block is junk if you break something (piston, ring, etc). If we go the minimum bore to clean it up, you at least have a chance to rebuild/fix it."

Made sense to me....

[Bobbed72]

Originally Posted by NC_John

My guy advised me to go the minimum overbore to clean it up. He said "we are putting a lot of money into this block (I did ALL the machine work to prep it right)- if we go max bore now you the block is junk if you break something (piston, ring, etc). If we go the minimum bore to clean it up, you at least have a chance to rebuild/fix it."

Made sense to me....

Yeah that does make a lot of sense.

[04ls1gto]

That cam does not look so great, I would see if you can get money back. You'll have more $$ in a rebuild then finding a low mine engine. Just food for thought

[Bobbed72]

Originally Posted by 04ls1gto

That cam does not look so great, I would see if you can get money back. You'll have more $$ in a rebuild then finding a low mine engine. Just food for thought

I saw that too. I was planning on a cam swap anyways.

[Bobbed72]

Thought I would post an update.

Since I needed to change the cam bearings and the tool cost as much as having a machine shop do it I took it to professional for cam bearing install, hot tank and cylinder hone.

Couple cylinders felt a little iffy after the hone so we decided on boring to the next size up. Since I will need new pistons I decided on flat tops for a performance boost. So far it's looking like I will have tripled my initial investment.

[NC_John]

Originally Posted by Bobbed72

Thought I would post an update.

Since I needed to change the cam bearings and the tool cost as much as having a machine shop do it I took it to professional for cam bearing install, hot tank and cylinder hone.

Couple cylinders felt a little iffy after the hone so we decided on boring to the next size up. Since I will need new pistons I decided on flat tops for a performance boost. So far it's looking like I will have tripled my initial investment.

All i ended up using on my pullout 6.0 was the block and the pcm. Everything else was replaced. I sold the rotating assembly and kept the 317 heads (in case I decide to boost it later) but everything else got scrapped.... live and learn....

[68c10airstream]

I was in the same boat with my junkyard 5.3. Ended up getting a BRAND NEW GM block and i believe summit or jegs is selling the 4/8.5.3 block for $500-600, free shipping and will have new cam bearings already installed. After i cleaned the factory antirust coating off it was a perfect stock bore ready for pistons. When you look at a re-bore and cam bearings and install labor i don't think there will be a big difference. Nothing against machinists, we need them, but i believe these blocks were gm extra stock they dumped when the great recession hit.

[davepl]

I feel for you! It could be worse, here's the 427 I bought that was just rebuilt and even came with full receipts! Fortunately I had already assumed for other reasons that I would have to rebuild it...

At first I was hoping it'd clean up but it was badly pitted. Enough that it'll need a sleeve. And if you look closely, the story gets even awesomer because the motor is already sleeved!

I guess the good news is it was already sleeved in the hole I need to sleeve.

[Bobbed72]

This has a happy ending albeit a slightly more expensive one. Motor completely rebuilt and runs beautifully. Waiting for the exhaust install.

[88Stanger]

nice job!

[Bobbed72]

Originally Posted by 88Stanger

nice job!

Thanks. This forum has been a big help with this project.