0.60 0ver 440?

[Cranky]

they recommend not going over .30 in the later waterblocks as the water holes are much larger and the nickel content in the block is less but in the earlier blocks they say anything upto .80 is okay but going over .30 they recommend sonic testing etc. like blackblazer said

Who recommends not going .030 over and what do you mean by the water holes are larger? Core shift can be a problem and that is why sonic testing is recommended but I don't know what you mean about water holes and as far as nickel content goes, I haven't seen that as being a problem. Judging just by the sound the boring tool makes in them, I would say the nickel content isn't much different if any. When you stick the boring bar into a Chevy block, you can really tell a difference in the sound. They sound like you're cutting peanut butter lol

 

[Sixer]

As I understand it, both early and late blocks are varied in the amount of overbore they can handle. The thinwall blocks are a myth, however they do suffer from greater core shift as a rule, but they all should be sonic tested when going 060, regardless of vintage. The early blocks were tougher (nickle content, as mentioned), the late actually thicker in many cases. In addition the late blocks had strength ribbing in the block sides, as well as beefier motor mount bosses. In any case, do not discount the viability of a late block as performance build material.

 

[fatecaptured]

i have a 75 440 .60 over bore.

 

[Roadbird]

i have a 75 440 .60 over bore.

Hows that working out for you?:headbang:

 

[RustyRatRod]

i have a 75 440 .60 over bore.

No Chrysler block ever made will bore that far. None. Zero. Zilch.

 

[fatecaptured]

Well it is sixty over. .060 or whatever. And its my profile picture. I can't tell u how well it runs. Life happened. Been away from the project for a few years. And i'm back working on my car again and i bout a charger recently also. I could hijack this thread with my story, but im not gonna do that. Right or wrong i got one and will let ya know how it runs. It came from the p.a.w.

 

[RustyRatRod]

Just trying to clarify that .60 is over 1/2". LOL

 

[fatecaptured]

Just trying to clarify that .60 is over 1/2". LOL

Yeah i wasn't catching on till i read it twice.

 

[RustyRatRod]

Yeah i wasn't catching on till i read it twice.

It's all good ....I was just pokin fun with you. lol

Also.....kinda back on topic. From those in the know, I have read that there were NO thin castings with big blocks. The problem arises with core shift. That said, common sense dictates that the later models are probably better than the earlier ones because of improvements in the casting process through the years. Still though, the only way to be sure is to sonic test. ....but frankly, I would throw a 440 on the bar so fast at .060 and never think twice. Look at it this way. You're talking .030 PER SIDE of the cylinder. If .030 makes the difference between go or no go, you had a piece of crap to begin with.