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Discussion Starter · #1 ·
So according to what I have read either .040 is max or .060 is ok as a cylinder bore on a late 60's 383 block. No sonic test available so anybody have an educated or experienced opinion?
 

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Go with the smallest overbore possible. Keeping the cylinder walls thicker will make more power then the few extra cubes gained from a bigger overbore
 

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My one 440 is bored to 60 over. My HP is a lot more then stock and haven't had any problems yet. Only thing I added was a 4 core rad.
 

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i wouldn't go more than .030 if you don't have it sonic tested, just my .02
 

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Discussion Starter · #5 ·
Talked to the machinist at our best (as far as I can tell...at least they have a deck plate for a BB) and he has been working at his job for 20 years. Told me that yes, .060 is a lot but he cant recall ever having a problem with one. Sonic costs about 120 bucks and I would already own the block by that time so I think I would just do it and let him sound out the cylinders with a little hammer after.
 
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The worst thing about .060 is that you aren't going to get another rebuild out of it.

BTW, does anyone know the max lift for a stock 69' 383 with flat tops?
 

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I have had several motors with 60 over and even strokers 60 over, it all depends # 1 on core shift, i got into this once before with someone else and they didn't under stand, if your core shift is bad then don't even bother sonic testing it, i don't even know why people go to that step without checking the core shift 1st.

Yes the smallest bore possible is nice when you build a block like i do and put 1500 into it so if something happens you get another shot at it. If it can accept 60 over and the core shift is acceptable and your not fixing every lifter bore and bushing it and truing every detail on the block then who cares if you can't use it again.
Personally i wouldn't use anything from a motor that came apart other than the carb, intake, headers, heads (unless the heads were hit) everything else to me is a omen
 
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