Thread: 350 rusted cylinder

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Hi All. You may have seen in a previous post that im tearing down a 350 for a rebuild. It was not spinning due to a rusted cylinder. Upon closer inspection there is some pitting that worked it way into the cylinder wall, leaving high and low spots that can be felt with your fingernail. In anyones past experience, is this easily repairable with an overbore? Is it likely the machine shop will have to go more than 030 over? Is it bad for the block to go 060 over if they have to? Or is this block junk?

I know you'll probably say to have it inspected by the machine shop, but just wanted to see if anyone had a previous experience.

Thanks.

There's no way to tell how deep the rust goes without boring until you hit clean metal. If you have to go past 0.030" on that cylinder, but the others clean up at 0.030", you could have the one cylinder sleeved. The block is not junk with one bad cylinder and the sleeved one is as good as new.

If they all clean up at 0.060", you'll have to make the call on cylinder wall thickness. I wouldn't do it, but then I'm a little conservative. There are probably thousands of 0.060"-over 350's running all over the place.

just tell the shop to punch it sixty over and run it.

Well, I guess Ill find out this weekend. I m hoping they can just do a 030 over. Im like techinspector...a little conservative, so I hope they dont have to go 060 over, although a friend of mine has it with no problems.

i've almost always bored my blocks sixty.

Right now I am running a 305 in my firebird which is sixty over, treat it like a dog, and thrash it regularly. It has been holding up for at least five years already.

This block cleaned up at 060 over!
Came back from the machine shop looking brand new....
I almost junked it... glad I didnt!

WHAT! - no NEW picture

That cylinder looks terrible - thanks for the update!

Wow, that cylinder looks awful. It looks way worse than mine! If that went 60 over, im thinking 30 or 40 over should hopefully fix mine, since my pitting is only felt with my fingernail. I feel better now.

Junk it it won't clean up on .030 There will be lot pits left.

Would'nt it be cheaper to use some heet.

I wish the previous owner would have thought of that.

enjoy your extra compression

Hey man look on the bright side, it's a good excuse for more displacement!

i had 5 of 6 cylinders in much worse condition than that in my rambler, they pistons had rusted into the cylinder walls, had to punch her out to .080 over, but luckily they left plenty of room on that flat head, i did have to have pistons made too.... motor is almost done.... cant wait to get that rambler roaring

Sorry guys, I let you down!
Here is the after picture!!!