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#1
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Cylinder bore thickness
I recently had a 1970 400ci block Sonic tested. Is there anyone here that can tell me what the common cylinder thickness numbers would be on a block of this year typically would be.? I attached a picture of the results to compare. Any input on this will really appreciated.
Thanks
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My Half AN Injun..... |
#2
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to see more between the bores. Maybe some one else with more knowledge might chime in. GT |
#3
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Thanks for your input
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My Half AN Injun..... |
#4
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My (limited experience) opinion is depends on what you’re doing with it. Since this is the race section, probably a strong build? From what I’ve seen those numbers would be just fine on most street builds. If you want some other opinions, here’s a thread I started on the same topic:
https://forums.maxperformanceinc.com...d.php?t=857000 My numbers were quite a bit worse, and I think it was about 50/50 go/no go. The most important part is the thrust side, and yours are plenty thick.
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67 LeMans, 326, M20, 3.31 12 Bolt |
#5
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Mine will be a street motor. We have no tracks over here ....
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My Half AN Injun..... |
#6
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It’s still hung up at a machine shop. I think he’s putting it off since it has a cracked sleeve and needs to be re-resleeved haha. I just had a 400 done at another nearby shop so I’m in no rush. If the resleeve turns out good, my plan is to make it a low comp 87 octane truck engine. I’m thinkin a short fill with block filler and I’ll be a-ok.
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67 LeMans, 326, M20, 3.31 12 Bolt |
#7
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That's worse than any I have tested. The shop I do business with doesn't like to see anything under .125 at finish bore size. The block is your foundation. Starting with a weak one is probably not a good idea.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
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#8
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Are you taking about Joes block or mine ?
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My Half AN Injun..... |
#9
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My Half AN Injun..... |
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#10
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I’m sure the shop did sonic the 400, but I’ll need to look for the paperwork. Would be interesting, I’ve seen people say on here that 67 400 blocks have the thickest walls and webbing.
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67 LeMans, 326, M20, 3.31 12 Bolt |
#11
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At least around me blocks are still around. I would invest in another one.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#12
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One thing i forgot to mention is that this block has a 4.160 bore. I think that's .035 over ..
I did this last minute after having it machined . Not the way to go about i know. But at least i know where the blocks at for cylinder thickness..
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My Half AN Injun..... |
#13
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How much did this cost Charlie ? I have a .060 over 67 400 that I would like to get checked out. |
#14
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125.00
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My Half AN Injun..... |
#15
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Troy , if you get it done please let me know what the results are .....
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My Half AN Injun..... |
#16
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No problem but I am not sure anyone around here does it. I will make some calls.
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#17
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Odd thinness at the For/aft CYL clock positions. Nice sonic measure awareness.
Hard-block up to the water pump hole edges and freeze plug edges out to reduce CYL worries. |
#18
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Sonic testers are more affordable than they once were.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#19
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I would much sooner do a half fill on a block for added support such as that with some questionable areas before putting in even a thin wall sleeve.
The main issue is that in hindsight that block should have been sonic check before the first bore job done to it and then the over bore could have been off set to maximize what was left for wall thickness.
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I do stuff for reasons. |
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#20
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell Last edited by hurryinhoosier62; 01-07-2023 at 09:50 PM. |
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