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Old 03-18-2013, 12:49 AM   #1
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Rebuild question

I'm rebuilding my 302 , this is my first rebuild. My question is , what is the best way to measure for new pistons. The cylinder walls are in good shape , so I'm going to just hone them. But I want to make sure the block has never been bored or anything like that. Would it be best to just measure the piston then order new pistons the same size or measure the actual cylinder. Thanks in advance.
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Old 03-18-2013, 01:19 AM   #2
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The top of the pistons should either have the part number stamped on them which you could look up and find the size. Or it will also have the size on it aswell, STD would mean standard bore. Or if its been bored they may say .030, .040, ect. If they are the original pistons they will have ford stamped on them also so you will know right away its a 4.00" bore.
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Old 03-18-2013, 01:31 AM   #3
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Oh ok, I know their not factory , that's why I was concerned it may have been bored . I'll look closer for some stamps. Thanks
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Old 03-18-2013, 06:32 AM   #4
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If u cant find the markings u will need to inside mic the bore.
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Old 03-18-2013, 06:35 AM   #5
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What about using a micrometer on the actual piston ?
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Old 03-18-2013, 07:16 AM   #6
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Quote:
Originally Posted by vettekiller View Post
What about using a micrometer on the actual piston ?
Same result as inside mic the bore. But you will have to have the pistons out of course.
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Old 03-18-2013, 07:21 AM   #7
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Great info , thanks
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Old 03-18-2013, 08:00 AM   #8
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No problem. I just want to clearify that micing the piston and bore will be slighty different because the pistons are undersized a small bit. It will give you the size of the piston though. The rings will take up the difference. I would probably inside mic the bore personally.
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Old 03-18-2013, 08:49 AM   #9
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Will do
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Old 03-19-2013, 05:40 PM   #10
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Ok so , I removed the pistons and measured the piston, it was 4" , I measured the bore it was 4.010 or so. So does that mean its stock ? I'm guessing the .010 is normal ? My piston wasn't stamped either :/ I just don't want my first rebuild to be a disaster. FYI, pistons slid out really easy , I didn't have to beat them out or anything
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Old 03-19-2013, 06:07 PM   #11
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Stock bore should be 4.00. Sounds likes its been freshened before. As long as you have your exact bore when you order your pistons and rings you should be good.
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Old 03-19-2013, 06:10 PM   #12
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Ok thanks
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