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Old 08-19-2013, 09:21 PM
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wierd markings on block.

I hope you can see them in the pic, I highlighted them in yellow but it did not work as well as I hoped. I found these odd markings on the underside of my 350 block. each cylinder has a letter stamped near it. also each corner of each cylinder has a 0 next to it. almost looks like a degree mark. I think it may be from the machine shop but can not say for sure. has anyone ever seen something like this or have an idea of the reason?
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Old 08-19-2013, 11:12 PM
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Originally Posted by snupytcb View Post
I hope you can see them in the pic, I highlighted them in yellow but it did not work as well as I hoped. I found these odd markings on the underside of my 350 block. each cylinder has a letter stamped near it. also each corner of each cylinder has a 0 next to it. almost looks like a degree mark. I think it may be from the machine shop but can not say for sure. has anyone ever seen something like this or have an idea of the reason?
Those are factory stampings indicating either main bearing sizes or bores. They have no relevance outside the factory.

Last edited by cobalt327; 08-19-2013 at 11:30 PM.
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Old 08-20-2013, 07:03 AM
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Those are factory stampings indicating either main bearing sizes or bores. They have no relevance outside the factory.

At the engine plant. The bores are size determined and correct size piston is assigned to each bore.. Pistons are marked with a letter code for size (lots of H K L sizes). The pan rail is marked for the correct piston. The block continues its journey down the line with pan rail up. As the parts move down the line, a worker loads the correct letter piston/ring/rod assemblies in carriers that match the bore position.
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Old 08-20-2013, 07:08 AM
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So I guess it was cheaper to use 4 different sized pistons than to machine 8 same sized holes?

Kelly
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Old 08-20-2013, 07:15 AM
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So I guess it was cheaper to use 4 different sized pistons than to machine 8 same sized holes?

Kelly
It's called mass production.. Tooling wears and STUFF happens.. Real world conditions..
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Old 08-20-2013, 07:21 AM
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I thought it was after market because I have never seen marks like this. when I found them I got a little worried thinking it was from blue printing or it was some special code. I had to stop working on it until I found out. thanks guy's.
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Old 08-20-2013, 07:30 AM
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It's called mass production.. Tooling wears and STUFF happens.. Real world conditions..

Sorry if my post was taken the wrong way, I did not intend any offense or to come across as a smart *****. I am all too familiar with mass production and their "adjustments" for tooling and etc. Have great day.

Kelly
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Old 08-21-2013, 05:12 PM
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Sorry if my post was taken the wrong way, I did not intend any offense or to come across as a smart *****. I am all too familiar with mass production and their "adjustments" for tooling and etc. Have great day.

Kelly
I got a chuckle out of that remark, I was thinking the same thing myself!
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