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Thread: Piston clearance??
          
   
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35chevy Piston clearance?? 09-20-2011, 07:00 PM
pat mccarthy what are you talking about ... 09-20-2011, 07:56 PM
35chevy Sorry Pat, I didn't realize I... 09-20-2011, 08:49 PM
pat mccarthy were are you measuring the... 09-20-2011, 09:07 PM
35chevy I'm measuring at the largest... 09-20-2011, 09:24 PM
pat mccarthy there is 3 ways to fix this... 09-21-2011, 01:25 AM
35chevy I called keith black and a... 09-21-2011, 11:15 AM
pat mccarthy did you check your mic with... 09-21-2011, 12:40 PM
cffisher Your getting awful techenical... 09-21-2011, 03:19 PM
pat mccarthy this is the way it Must be i... 09-21-2011, 04:12 PM
35chevy Yep that was... 09-21-2011, 03:45 PM
pat mccarthy well your not good if you... 09-21-2011, 04:05 PM
35chevy just go ahead and chew me... 09-21-2011, 04:42 PM
cffisher I understand. Where I used to... 09-21-2011, 04:19 PM
35chevy Why should I take that sign... 09-21-2011, 10:19 PM
35chevy I know you were teasing. I... 09-22-2011, 09:59 AM
pat mccarthy i did not chew you out but... 09-22-2011, 05:44 AM
35chevy Pat, as far as boring the... 09-22-2011, 06:38 AM
pat mccarthy there many ways of doing the... 09-22-2011, 06:58 AM
1gary Here is a link to topics... 09-22-2011, 09:02 AM
35chevy thanks for the link. I saw... 09-22-2011, 10:27 AM
jerry clayton Let's see---what I did this... 09-22-2011, 03:48 PM
pat mccarthy you were by the shop and did... 09-22-2011, 04:23 PM
jerry clayton No Pat, we went south because... 09-22-2011, 05:40 PM
pat mccarthy no i am not that far north... 09-22-2011, 05:47 PM
  1. #1
    35chevy's Avatar
    35chevy is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '35 Master Chevrolet
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    Piston clearance??

     



    So, I started with a .030 over 509 block 400 with a good bit of wear, and I really didn't want to go .060. So I did what everyone says not to do and bored it without having the pistons just to see if it would clean up before I bought the pistons. I bored it 4.163 which would be .038 over and it wasnt clean on three holes. So I ended up having to go dead on .040 over at 4.165 and two holes still had a small place at the very bottom where the bit didn't touch. I measured it and I could see where it didn't clean up but couldn't really measure it. So I got my neighbor (who owns the machine shop...he is in his 80's and retired) to measure it and he got the same results which was less than half a thousandth. So I bought a set of .040 keith black kb147's and thats as far as I got. That was in 2009. I just got back on it this week and as you can tell I havn't exactly been in a hurry. I measured the pistons last night and found that they measure 4.161, so with my block being 4.165 I have .004 clearance. Keith Black recommends .002-.0025 clearance for street applications so should I go ahead with the .004 clearance I have or do something different? Here is what gripes me....if I was going to design a piston that was meant to be installed in a .040 over 400 block, I would make them 4.063 which would give .002 clearance in a 4.065 block. Isn't that too simple?? My block wouldn't clean up on the .038 over that these pistons require, so what do I do now?
    Last edited by 35chevy; 09-20-2011 at 08:18 PM.
    Hanging with my Dad.

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