Cylinder Wall Scrapes
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 892
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From: GA
Cylinder Wall Scrapes
Hi everyone, I have had my motor out and taken down to the short block for some time. I found "mild" scrapes about 1/2 down two of the cylinder walls. I can BEARLY feel them with my finger nail. I was told this is probably due to the piston skirt touching. The block looks clean, freeze plugs and oil plugs look brand new. The pistons have some oil burned on top, but that is because my heads were crap. A bad spring round one of the cam lobes. Should I be concerned about the scrapes? I was going to have the block machined and checked.... It is already .030. What would you guys suggest??? I was thinking of putting on a new set of heads and stab in a cam and lifters.. then drop her in... I was thinking Vortec heads or AFR 190..... Thanks for the help...
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Cylinder Wall Scrapes (Mr.Gearhead)
The machine shop will measure for out of round and ware. Some times you can get away with just a hone on a low mile rebuild. Or they can clean it up with a .010 over which in your case is 4.040. I've run .060 over 4 bolt blocks without a problem. I used to even have a sleeved block because I had a couple of rods that went through the cylinder wall.
It's not a big deal if you have a good machine shop.
It's not a big deal if you have a good machine shop.
Pro
Joined: Dec 2000
Posts: 531
Likes: 0
Re: Cylinder Wall Scrapes (Mr.Gearhead)
Hone it. More will get past your "out of the box rings" than past those scratches. You won't be able to tell the difference, besides you're going to drive it like you stole it anyway. Honestly you can get away with a lot of stuff.
Pro
Joined: Aug 2001
Posts: 605
Likes: 0
From: hamilton square NJ
Re: Cylinder Wall Scrapes (Mr.Gearhead)
If it can catch your finger nail it's too deep. I would bore to the next larger size. That motor will not last more than 30,000 miles if you don't have a clean bore. Go with a .040 if you can. Better safe.
[Modified by xfactor974, 5:40 PM 7/6/2002]
[Modified by xfactor974, 5:40 PM 7/6/2002]
